Learn notes PHP string processing functions Summary _php Tutorial

PHP after a long period of development, many users are very familiar with PHP, here I published a personal understanding of the PHP string processing function, I hope to help everyone, PHP itself is a simple and powerful language.

The PHP language has core features such as powerful string and array processing capabilities, while greatly improving the support for object-oriented programming (PHP5 and above). By using standard and optional extensions, PHP applications can connect more than 10 databases such as MySQL or Oracle, draw, create PDF files, and create parsing XML files. You can also use the C language to write your own PHP extension module. For example, provide an interface function for PHP in a code base that already exists. You can also run PHP under Windows, use COM to control other Windows applications such as Word and Excel, or use ODBC to connect to a database, and here's a little bit of knowledge of PHP string handlers.

PHP String processing function Summary:

 
 

  
  

  
addcslashes--adds a backslash escape character for some characters inside a string
  
  

  
addslashes--characters inside a string are escaped in the specified manner
  
  

  
bin2hex--converts binary data to hexadecimal notation
  
  

  
chr--returns the ASCII code of a character
  
  

  
chunk_split--divide a string into small pieces at a certain length of character
  
  

  
convert_cyr_string--converting Slavic characters to other characters
  
  

  
convert_uudecode--decrypting a string
  
  

  
convert_uuencode--Encrypt a string
  
  

  
count_chars--returns the character usage information for a string
  
  

  
crc32--computes a crc32 polynomial of a string
  
  

  
crypt--one-way hash encryption function
  
  

  
explode--converts a string into an array form with a separator
  
  

  
fprintf--returns data as required and writes directly to the document stream
  
  

  
get_html_translation_table--returning HTML entities that can be converted
  
  

  
Inverse of the html_entity_decode--htmlentities () function to convert HTML entities to characters
  
  

  
htmlentities--convert some characters in a string to HTML entities
  
  

  
Inverse of the htmlspecialchars_decode--htmlspecialchars () function to convert HTML entities to characters
  
  

  
htmlspecialchars--convert some characters in a string to HTML entities
  
  

  
implode--to convert an array to a string with a specific separator character
  
  

  
join--convert an array to a string, alias of the Implode () function
  
  

  
levenshtein--Calculate the difference size of two words
  
  

  
localeconv--getting a number-related format definition
  
  

  
ltrim--to remove whitespace to the left of a string or to a specified character
  
  

  
md5_file--a file for MD5 algorithm encryption
  
  

  
md5--a string for MD5 algorithm encryption
  
  

  
metaphone--judging the pronunciation rules of a string
  
  

  
money_format--output of numbers formatted according to parameters
  
  

  
nl_langinfo--querying language and local information
  
  

  
nl2br--Replace the line break "n" in the string with "
  
  

  
”
  
  

  
number_format--output of numbers formatted according to parameters
  
  

  
ord--converts an ASCII code to one character
  
  

  
parse_str--Convert a string of a certain format into a variable and a value
  
  

  
print--used to output a single value
  
  

  
printf--data Display as required
  
  

  
quoted_printable_decode--to encrypt a string into a 8-bit binary string
  
  

  
quotemeta--to escape a number of specific characters
  
  

  
rtrim--remove whitespace to the right of a string or a specified character
  
  

  
setlocale--setting local formats for numbers, dates, and so on
  
  

  
sha1_file--a file for SHA1 algorithm encryption
  
  

  
sha1--a string for SHA1 algorithm encryption
  
  

  
similar_text--compares two strings and returns the number of similar characters that the system thinks
  
  

  
soundex--judging the pronunciation rules of a string
  
  

  
The sprintf--returns the data as required, but does not output
  
  

  
sscanf--can format a string
  
  

  
str_ireplace--matches and replaces strings like the Str_replace () function, but is case insensitive
  
  

  
str_pad--padding on both sides of a string
  
  

  
str_repeat--repeating combinations of strings
  
  

  
str_replace--matching and replacing strings
  
  

  
str_rot13--string for ROT13 encryption processing
  
  

  
str_shuffle--random ordering of characters inside a string
  
  

  
str_split--splits a string into an array by character spacing
  
  

  
str_word_count--get the English word information inside the string
  
  

  
strcasecmp--size comparison of strings, case insensitive
  
  

  
strchr--the alias of a partial strstr () function that returns a string by comparison
  
  

  
strcmp--size comparison of strings
  
  

  
strcoll– size comparison of strings based on local settings
  
  

  
strcspn--returns the value of a continuous non-matching length of characters
  
  

  
strip_tags--remove HTML and PHP code from a string
  
  

  
stripcslashes--inverse literal addcslashes () function escapes processed strings
  
  

  
stripos--finds and returns the position of the first occurrence, matching is case-insensitive
 
 

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