_php examples of common functions in PHP based on review

array_change_key_case-returns an array with a string key that is all lowercase or uppercase
array_chunk-to split an array into multiple
Array_combine-creates an array with the value of one array as its key name and the value of the other array as its value
array_count_values-counts the number of occurrences of all values in the array
array_diff_assoc-the difference set of an array computed with an index check
array_diff_key-the difference set of an array using a key name comparison
array_diff_uassoc-an index check using user-supplied callback functions to compute the difference set of an array
array_diff_ukey-Comparison of a key name with a callback function to compute the difference set of an array
array_diff-Calculating the difference set of an array
Array_fill_keys-fill an array with values, specifying keys
Array_fill-fills the array with the given value
Array_filter-using callback functions to filter cells in an array
array_flip-the keys and values in the swap array
array_intersect_assoc-the intersection of computed arrays with index checking
Array_intersect_key-computes the intersection of an array using a key name comparison
array_intersect_uassoc-the intersection of computed arrays with index checking, using callback functions to compare indexes
Array_intersect_ukey-computes the intersection of an array using a callback function to compare the key name
array_intersect-compute the intersection of arrays
array_key_exists-checks whether the given key name or index exists in the array
array_keys-returns all the key names in the array
Array_map-the callback function to the cell of the given array
Array_merge_recursive-recursively merges one or more arrays
array_merge-merge one or more arrays
array_multisort-to sort multiple arrays or multidimensional arrays
Array_pad-fills an array to a specified length with a value
array_pop-the last cell of the array (out of stack)
Array_product-calculates the product of all the values in an array
array_push-one or more cells into the end of the array (into the stack)
array_rand-one or more cells randomly from an array
Array_reduce-the array to a single value using the callback function iteratively
array_reverse-returns an array of cells in reverse order
array_search-searches the array for a given value and returns the corresponding key name if successful
Array_shift-the cells at the beginning of the array by moving the group
Array_slice-a paragraph from the array
Array_splice-the part of the array and replaces it with other values.
array_sum-computes the value of all values in the array
array_udiff_assoc-the difference set of an array with an index check to compare data with a callback function
array_udiff_uassoc-the difference set of an array with an index check to compare data and indexes with a callback function
Array_udiff-uses callback functions to compare data to compute the difference set of an array
array_uintersect_assoc-with index checking the intersection of arrays, using callback functions to compare data
array_uintersect_uassoc-with index checking the intersection of arrays, comparing data and indexes with callback functions
Array_uintersect-computes the intersection of arrays, using callback functions to compare data
array_unique-the duplicate values in the divisor group
array_unshift-inserts one or more cells at the beginning of an array
array_values-returns all the values in the array
array_walk_recursive-user functions recursively in each member of an array
array_walk-apply user functions to each member in an array
array-Create a new array
arsort-an array to reverse sort and keep an indexed relationship
Asort-an array to sort and keep an indexed relationship
Compact-creates an array, including variable names and their values.
count-calculate the number of cells in an array or the number of attributes in an object
current-returns the current cell in the array
each-returns the current key/value pair in the array and moves the array pointer one step forward
End-the internal pointer of an array to the last cell
extract-import variables from an array into the current symbol table
in_array-Check to see if a value exists in the array
Key-gets the key name from the associative array
krsort-Arrays in reverse order by key name
ksort-Array by Key name
List-assigns the values in the array to some variables
natcasesort-sorting by using the "natural sort" algorithm for case-insensitive alphabetical groups
natsort-sorting with the "natural sort" algorithm
next-moves the internal pointer in the array forward one
Alias for Pos-current ()
prev-the internal pointer of an array back to a
Range-set up an array containing the specified range of cells
Reset-the internal pointer of an array to the first cell
Reverse ordering of rsort-pairs of groups
shuffle-the array
Alias for Sizeof-count ()
sort-Array Sorting
Uasort-uses the user-defined comparison function to sort the values in the array and keep the index associated
Uksort-uses the user-defined comparison function to sort the key names in the array
usort-use the user-defined comparison function to sort the values in the array
Call_user_method_array-calls a user method, passing a parameter array (deprecated)
Call_user_method-invokes a user method on a specific object (deprecated)
class_exists-Check whether a class is defined
get_class_methods-returns an array of the class's method names
get_class_vars-returns an array of the default properties of the class
get_class-returns the class name of the object
get_declared_classes-returns an array of the names of the defined classes
get_declared_interfaces-returns an array containing all declared interfaces
get_object_vars-returns an associative array consisting of object properties
get_parent_class-returns the parent class name of an object or class
interface_exists-Check if the interface has been defined
is_a-returns TRUE if the object belongs to the class or the class is the parent of this object
is_subclass_of-returns TRUE If this object is a subclass of the class
method_exists-Check if the method of the class exists
property_exists-check whether an object or class has this property
checkdate-verify a Gregorian high date
Date_default_timezone_get-Gets the default time zone used by all date-time functions in a script
date_default_timezone_set-Sets the default time zone for all date-time functions in a script
Date_time_set-sets the time
Date_timezone_get-return time zone relative to given DateTime
Date_timezone_set-sets the time zone for the DateTime object
date-format a local time/date
getdate-Get Date/time information
gettimeofday-to get the current time
gmdate-format a GMT/UTC date/time
gmmktime-UNIX time stamp with GMT date
gmstrftime-format GMT/UTC Time/date according to locale
idate-format a local time date as an integer
localtime-Get local time
microtime-returns the current Unix timestamp and microsecond number
mktime-to get a date on a Unix timestamp
strftime-format local time/date according to locale
strptime-resolves the date/time generated by strftime ()
strtotime-resolves a date-time description of any English text to a Unix timestamp
time-returns the current Unix timestamp
chdir-Change Directory
chroot-Change the root directory
Dir-directory class
closedir-Close Directory Handle
Getcwd-get Current working directory
opendir-Open Directory Handle
readdir-read entries from a directory handle
rewinddir-back to directory handle
scandir-lists the files and directories in the specified path
basename-returns the file name part of the path
chgrp-change the group to which the file belongs
chmod-Change File Mode
chown-change the owner of the file
clearstatcache-Purge file state cache
copy-Copy Files
delete-See unlink () or unset ()
dirname-returns the directory part of the path
disk_free_space-returns the available space in the catalog
disk_total_space-returns the total disk size of a directory
Alias for Diskfreespace-disk_free_space ()
fclose-closes an open file pointer
feof-the test file pointer to the end of the file
fflush-output The buffered content to a file
Fgetc-reads characters from the file pointer
Fgetcsv-reads a line from the file pointer and resolves the CSV field
Fgets-reads a row from the file pointer
Fgetss-reads a row from the file pointer and filters out the HTML markup
file_exists-check whether a file or directory exists
file_get_contents-reads the entire file into a string
File_put_contents-writes a string to a file
File-reads the entire file into an array
Fileatime-last access time for files
Filectime-Gets the Inode modification time of the file
filegroup-the group that gets the file
Fileinode-get the inode of the file
filemtime-Get File modification time
Fileowner-gets the owner of the file
fileperms-permission to obtain files
filesize-Get File size
filetype-Get file type
flock-Lightweight Consultation File lock
fnmatch-match filename with pattern
fopen-open a file or URL
fpassthru-all remaining data at the output file pointer
fputcsv-the row into CSV and writes the file pointer
Alias for Fputs-fwrite ()
fread-read files (can be used securely in binary files)
fscanf-format input from a file
fseek-position in file pointer
fstat-access to file information through an open file pointer
ftell-returns the location of the file pointer read/write
ftruncate-the file to a given length
fwrite-Write to file (safe for binary files)
glob-find a file path that matches the pattern
is_dir-determine if a given file name is a directory
is_executable-to determine if a given file name is executable
is_file-to determine if a given file name is a normal file
is_link-determines whether a given file name is a symbolic connection
is_readable-to determine if a given file name is readable
is_uploaded_file-to determine if the file was uploaded via an HTTP POST
is_writable-to determine if a given filename is writable
Alias for Is_writeable-is_writable ()
Lchgrp-changes Group Ownership of Symlink
Lchown-changes user ownership of Symlink
link-Establish a hard connection
Linkinfo-to get a connection information
Lstat-gives information about a file or symbolic connection
mkdir-New Directory
Move_uploaded_file-move uploaded files to a new location
parse_ini_file-resolves a configuration file
pathinfo-returns the file path information
pclose-shutdown Process file pointer
popen-Open Process file pointer
readfile-output a file
readlink-returns the target to which the symbolic connection points
realpath-returns the canonical absolute path name
rename-rename a file or directory
Rewind-back to the location of the file pointer
rmdir-Delete Directory
Alias for Set_file_buffer-stream_set_write_buffer ()
stat-gives the file information
symlink-to establish a symbolic connection
tempnam-to create a file with a unique file name
tmpfile-Create a temporary file
touch-settings file access and modification time
umask-Change the current umask
unlink-Delete Files
mail-Send mail
abs-Absolute Value
acos-Anti-cosine
acosh-Inverse hyperbolic cosine
asin-anyway Chord
asinh-Inverse hyperbolic sine
atan2-two-parameter tangent
atan-anyway cut
atanh-Inverse hyperbolic tangent
Base_convert-converts numbers between arbitrary systems
bindec-binary conversion to decimal
Ceil-into one method to take the whole
cos-cosine
cosh-Hyperbolic cosine
decbin-Decimal conversion to Binary
dechex-decimal conversion to hexadecimal
decoct-Decimal conversion to octal
deg2rad-converts an angle to radians
Exp-calculates the index of E
Expm1-returns exp (number) –1, even when the value of number is close to 0 to calculate the exact result
Floor-the method of rounding out
Fmod-to return the floating-point number remainder of division
getrandmax-display the maximum possible value of random number
hexdec-16 Convert to Decimal
Hypot-calculates the hypotenuse length of a corner triangle
Is_finite-judge whether it is a finite value
Is_infinite-Determine whether it is an infinite value
is_nan-judge whether it is a legal value
lcg_value-Combination Linear congruence generator
log10-with a 10-base logarithm
log1p-returns log (1 + number), even when the value of number is close to 0 to calculate the exact result
log-Natural logarithm
max-Find the maximum value
min-Find the Minimum value
mt_getrandmax-display the maximum possible value of random numbers
mt_rand-to generate better random numbers
Mt_srand-to sow a better random number generator seed
octdec-octal conversion to decimal
pi-Get pi Value
pow-exponential expression
Rad2deg-converts the number of radians to the corresponding number of angles
Rand-produces a random integer
round-the floating-point numbers
sin-sine
sinh-hyperbolic sine
sqrt-Square Root
Seed of random number generator under srand-sowing
tan-Tangent
tanh-Hyperbolic tangent
mysql_affected_rows-the number of record rows affected by the previous MySQL operation
mysql_change_user-change the user who is logged on in the active connection
mysql_client_encoding-returns the name of the character set
mysql_close-Close MySQL Connection
Mysql_connect-Open a connection to the MySQL server
mysql_create_db-Create a new MySQL database
mysql_data_seek-A pointer to move the inner result
mysql_db_name-Obtain the result data
mysql_db_query-Send a MySQL query
mysql_drop_db-Discard (delete) a MySQL database
Mysql_errno-returns the digital encoding of the error message in the previous MySQL operation
mysql_error-returns the text error message from the previous MySQL operation
Mysql_escape_string-escapes a string for mysql_query
Mysql_fetch_array-takes one row from the result set as an associative array, or an array of numbers, or both
Mysql_fetch_assoc-gets one row from the result set as an associative array
mysql_fetch_field-gets column information from the result set and returns as an object
Mysql_fetch_lengths-gets the length of each output in the result set
Mysql_fetch_object-gets one row from the result set as an object
Mysql_fetch_row-takes one row from the result set as an enumeration array
Mysql_field_flags-the flags that are associated with the specified field from the result
mysql_field_len-returns the length of the specified field
Mysql_field_name-Gets the field name of the specified field in the result
mysql_field_seek-set the pointer in the result set to the Set field offset
Mysql_field_table-gets the name of the table that contains the specified field
Mysql_field_type-gets the type of the field specified in the result set
mysql_free_result-Release result memory
Mysql_get_client_info-Get MySQL Client Information
Mysql_get_host_info-Get MySQL host information
Mysql_get_proto_info-Get MySQL protocol information
mysql_get_server_info-Get MySQL Server information
Mysql_info-get the latest query information
Mysql_insert_id-gets the ID generated by the previous insert operation
mysql_list_dbs-lists all the databases in the MySQL server
mysql_list_fields-lists the fields in the MySQL results
mysql_list_processes-List the MySQL process
mysql_list_tables-lists the tables in the MySQL database
Mysql_num_fields-gets the number of fields in the result set
mysql_num_rows-the number of rows in the result set
mysql_pconnect-open a persistent connection to the MySQL server
Mysql_ping-ping a server connection and reconnect if there is no connection
mysql_query-Send a MySQL query
Mysql_real_escape_string-the special characters in the string used in the escape SQL statement, taking into account the current character set of the connection
mysql_result-Obtain the result data
mysql_select_db-Choose MySQL Database
mysql_stat-Get current system state
mysql_tablename-Get Table name
Mysql_thread_id-returns the ID of the current thread
Mysql_unbuffered_query-sends a SQL query to MySQL and does not get and cache the results of the row
flush-Refresh Output Buffer
Ob_clean-clean (erase) The output buffer
Ob_end_clean-clean (erase) The output buffer and turn off output buffering
Ob_end_flush-flush (send) The output buffer and turn off output buffering
Ob_flush-flush (send) the output buffer
Ob_get_clean-get Current buffer contents and delete current output buffer
Ob_get_contents-return the contents of the output buffer
Ob_get_flush-flush the output buffer, return it as a string and turn off output buffering
Ob_get_length-return the length of the output buffer
Ob_get_level-return The nesting level of the output buffering mechanism
Ob_get_status-get Status of output buffers
Ob_gzhandler-ob_start callback function to gzip output buffer
Ob_implicit_flush-turn Implicit flush On/off
Ob_list_handlers-list all output handlers in
Ob_start-turn on output buffering
Output_add_rewrite_var-add URL rewriter Values
Output_reset_rewrite_vars-reset URL rewriter Values
preg_grep-returns the array cells that match the pattern
Preg_last_error-returns the error code of the last PCRE regex execution
preg_match_all-for global Regular expression matching
preg_match-for regular expression matching
Preg_quote-Escape Regular Expression characters
Preg_replace_callback-performs search and replace of regular expressions with callback functions
Preg_replace-performs search and replace of regular expressions
Preg_split-split strings with regular expressions
Session_cache_expire-return Current Cache Expire
Session_cache_limiter-get and/or set the current cache limiter
Alias for Session_commit-session_write_close ()
Session_decode-decodes session data from a string
Session_destroy-destroys all data registered to a
Session_encode-encodes the current session data into a string
Session_get_cookie_params-get the session cookie parameters
Session_id-get and/or set the current session ID
Session_is_registered-find out whether a global variable be registered in a session
Session_module_name-get and/or set the current session module
Session_name-get and/or set the current session name
Session_regenerate_id-update the current session ID with a newly generated one
Session_register-register one or more global variables
Session_save_path-get and/or set the current session save path
Session_set_cookie_params-set the session cookie parameters
Session_set_save_handler-sets User-level Session Storage functions
Session_start-initialize Session Data
Session_unregister-unregister a global variable from the
Session_unset-free All Sessions variables
Session_write_close-write session data and end session
ereg_replace-Regular Expression substitution
ereg-Regular expression matching
eregi_replace-Regular expression substitution without case sensitivity
eregi-regular expression matching without case sensitivity
Split-the string into an array with a regular expression
spliti-splits a string into an array with regular expressions case-insensitive
Sql_regcase-produces regular expressions for case-insensitive matching
addcslashes-use backslashes to escape characters in a string in C language style
addslashes-use backslashes to refer to strings
bin2hex-converts binary data to hexadecimal representations
Alias for Chop-rtrim ()
chr-returns the specified character
chunk_split-splits a string into small chunks
count_chars-information that returns the character used for the string
crc32-computes a crc32 polynomial of a string
Crypt-one-way string encryption (hashing)
Echo-output one or more strings
explode-use a string to split another string
Fprintf-write a formatted string to a stream
Get_html_translation_table-returns the translation table used by Htmlspecialchars () and Htmlentities ()
Hebrev-convert logical Hebrew Text to visual text
Hebrevc-convert logical Hebrew Text to visual text with newline conversion
Html_entity_decode-convert all HTML entities to their applicable characters
Htmlentities-convert all applicable characters to HTML entities
Htmlspecialchars_decode-convert Special HTML entities back to characters
Htmlspecialchars-convert special characters to HTML entities
Implode-join array elements with a string
join-alias Implode ()
Levenshtein-calculate Levenshtein distance between two strings
Localeconv-get Numeric formatting information
Ltrim-strip whitespace (or other characters) from the beginning of a string
Md5_file-calculates the MD5 hash of a given file
Md5-calculate the MD5 hash of a string
Metaphone-calculate the Metaphone key of a string
Money_format-formats a number as a currency string
Nl_langinfo-query Language and locale information
Nl2br-inserts HTML line breaks before all newlines in a string
Number_format-format a number with grouped thousands
Ord-return ASCII value of character
Parse_str-parses the string into variables
Print-output a string
Printf-output a formatted string
Quoted_printable_decode-convert a quoted-printable string to a 8 bit string
Quotemeta-quote Meta characters
Rtrim-strip whitespace (or other characters) from the end of a string
Setlocale-set locale Information
Sha1_file-calculate The SHA1 hash of a file
Sha1-calculate The SHA1 hash of a string
Similar_text-calculate the similarity between two strings
Soundex-calculate the Soundex key of a string
Sprintf-return a formatted string
Sscanf-parses input from a string according to a format
Str_getcsv-parse a CSV string into an array
Str_ireplace-case-insensitive version of Str_replace ().
Str_pad-pad a string to a certain length with another string
Str_repeat-repeat a string
Str_replace-replace all occurrences to the search string with the replacement string
Str_rot13-perform the rot13 transform on a string
Str_shuffle-randomly shuffles A string
Str_split-convert a string to a array
Str_word_count-return information about words used in a string
Strcasecmp-binary Safe case-insensitive string comparison
strchr-alias Strstr ()
Strcmp-binary Safe string comparison
Strcoll-locale based string comparison
Strcspn-find length of initial segment not matching mask
Strip_tags-strip HTML and PHP tags from a string
Stripcslashes-un-quote string quoted with Addcslashes ()
Stripos-find position of occurrence a case-insensitive string
Stripslashes-un-quote string quoted with Addslashes ()
Stristr-case-insensitive strstr ()
Strlen-get string length
Strnatcasecmp-case insensitive string comparisons using a "natural order" algorithm
Strnatcmp-string comparisons using a "natural order" algorithm
Strncasecmp-binary Safe case-insensitive string comparison of the the ' the ' of the ' the '
Strncmp-binary safe string Comparison of the the ' the ' of the ' the ' the '
Strpbrk-search a string for any of a set of characters
Strpos-find position of occurrence a string
Strrchr-find the last occurrence of a character in a string
Strrev-reverse a string
Strripos-find position of occurrence of a case-insensitive string in a string
Strrpos-find position of occurrence of a char in a string
Strspn-find length of initial segment matching mask
Strstr-find Occurrence A string
Strtok-tokenize string
Strtolower-make a String lowercase
Strtoupper-make A string uppercase
Strtr-translate certain characters
Substr_compare-binary Safe Optionally case insensitive comparison of 2 strings out of offset, up to length characters
Substr_count-count the number of substring occurrences
Substr_replace-replace text within a portion of a string
Substr-return part of a string
Trim-strip whitespace (or other characters) from the beginning and end of a string
Ucfirst-make A string ' s-A-character uppercase
Ucwords-uppercase the character of each word in a string
Vfprintf-write a formatted string to a stream
Vprintf-output a formatted string
Vsprintf-return a formatted string
Wordwrap-wraps a string to a given number of characters using a string break character
base64_decode-decoding of data encoded using MIME base64
Base64_encode-uses MIME base64 to encode data
Get_headers-gets the server to respond to all headers sent by an HTTP request
get_meta_tags-extracts all meta tag content attributes from a file and returns an array
http_build_query-the request string after generating Url-encode
parse_url-resolves the URL and returns its components
rawurldecode-decoding of encoded URL strings
rawurlencode-to encode URLs according to RFC 1738
urldecode-decoding of encoded URL strings
urlencode-encoded URL string
Debug_zval_dump-dumps a string representation of internal Zend value to output
Alias for Doubleval-floatval ()
empty-Check if a variable is empty
Floatval-gets the floating-point value of a variable
get_defined_vars-returns an array of all defined variables
get_resource_type-return Resource (Resource) type
Gettype-gets the type of the variable
import_request_variables-to import Get/post/cookie variables into the global scope
intval-gets the integer value of the variable
is_array-detect whether the variable is an array
Is_binary-finds whether a variable is a native binary string
is_bool-detect whether a variable is a Boolean
Is_buffer-finds whether a variable is a native Unicode or binary string
Whether the is_callable-detection parameter is a valid callable structure
Alias for Is_double-is_float ()
Is_float-detect whether a variable is a floating-point type
is_int-detect whether a variable is an integer
Alias for Is_integer-is_int ()
Alias for Is_long-is_int ()
is_null-detect whether the variable is null
is_numeric-detect whether a variable is a numeric or numeric string
Is_object-detect whether a variable is an object
Alias for Is_real-is_float ()
is_resource-detect whether a variable is a resource type
is_scalar-detect whether a variable is a scalar
is_string-detect whether a variable is a string
Is_unicode-finds whether a variable is a Unicode string
Isset-detect whether the variable is set
print_r-Print Easy to understand information about variables.
Serialize-produces a representation of a value that can be stored
settype-set the type of variable
Strval-gets the string value of a variable
unserialize-create PHP values from stored representations
Unset-frees the given variable
var_dump-related information about printing variables
var_export-output or returns a string representation of a variable