PHP5 string processing functions

Summary of php5 string processing functions, which are frequently used by php users. Easy to search and use. Addcslashes-add backslash escape characters to some characters in the string
Addslashes-escape characters in the string in the specified method
Bin2hex-Convert binary data to hexadecimal representation
Alias function of chop-rtrim ()
Chr-returns the ASCII code of a character.
Chunk_split-splits a string into small parts based on a certain character length
Convert_cyr_string-converts a Slavic character to another character
Convert_uudecode-decrypts a string
Convert_uuencode-encrypt a string
Count_chars-returns the character usage information in a string.
Crc32-calculate the crc32 polynomial of a string
Crypt-one-way hash encryption function
Echo-used to display some content
Explode-convert a string into an array using a delimiter
Fprintf-return data as required and directly write data to the document stream
Get_html_translation_table-returns the HTML entity that can be converted.
Hebrev-converts a Hebrew-encoded string to a visualized text
Hebrevc-convert Hebrew-encoded strings into visualized text
The inverse function of the html_entity_decode-htmlentities () function, which converts an HTML object to a character.
Htmlentities-convert some characters in a string to HTML entities
The inverse function of the htmlspecialchars_decode-htmlspecialchars () function, which converts an HTML object to a character.
Htmlspecialchars-convert some characters in a string to HTML entities
Implode-convert an array into a string using a specific delimiter
Join-convert an array into a string, alias of the implode () function
Levenshtein-calculate the differences between two words
Localeconv-get format definitions related to numbers
Ltrim-removes white spaces or specified characters on the left of the string
Md5_file-encrypt an object using the MD5 algorithm
Md5-encrypt a string using the MD5 algorithm
Metaphone-rules for determining the pronunciation of a string
Money_format-formatted output of numbers based on parameters
Nl_langinfo-query language and local information
Nl2br-replace the linefeed "" in the string with"
"
Number_format-formatted output of numbers based on parameters
Ord-converts an ASCII code to a character
Parse_str-convert strings of certain formats into variables and values
Print-Used to output a separate value
Printf-display data as required
Quoted_printable_decode-encrypt a string into an 8-bit binary string
Quotemeta-escape certain characters
Rtrim-removes spaces or specified characters on the right of the string
Setlocale-set the local format of numbers, dates, and so on
Sha1_file-encrypt a file using the SHA1 algorithm
Sha1-encrypt a string using the SHA1 algorithm
Similar_text-compares two strings and returns the number of similar characters that the system considers.
Soundex-rules for determining the pronunciation of a string
Sprintf-return data as required, but do not output
Sscanf-you can format strings.
Str_ireplace-match and replace strings like the str_replace () function, but not case sensitive
Str_pad-pad both sides of the string
Str_repeat-repeated string combination
Str_replace-match and replace strings
Str_rot13-encrypt the string with ROT13
Str_shuffle-random sorting of characters in a string
Str_split-splits a string into an array based on the character spacing
Str_word_count-get the English word information in the string
Strcasecmp-compare the string size, case insensitive
Strchr-returns the alias of some strstr () functions of a string through comparison
Strcmp-compare the string size
Strcoll-compare the string size based on local settings
Strcspn-returns the value of consecutive non-matching lengths.
Strip_tags-remove HTML and PHP code from a string
Stripcslashes-returns the string processed by the addcslashes () function escape function.
Stripos-locate and return the position of the first matching item. the matching is case insensitive.
Stripslashes-returns the string that has been escaped by the implicit addslashes () function.
Stristr-returns the part of a string through comparison. the comparison is case insensitive.
Strlen-get the encoding length of a string
Strnatcasecmp-use the natural sorting method to compare the string size, case insensitive
Strnatcmp-use the natural sorting method to compare the string size
Strncasecmp-compare the size of the first N characters of a string, case insensitive
Strncmp-compare the size of the first N characters of a string
Strpbrk-returns the part of a string through comparison
Strpos-locate and return the position of the first matching item
Strrchr-returns the part of a string through comparison from the back to the back
Strrev-reverse sort all letters in the string
Strripos-search from the back and return the position of the first matching item. the matching is case insensitive.
Strrpos-search from the back and return the position of the first matching item
Strsps-matched and returned continuous length of characters
Strstr-returns the part of a string through comparison
Strtok-use a specified number of characters to separate strings
Strtolower-convert string to lowercase
Strtoupper-converts a string to uppercase
Strtr-replace string comparison
Substr_compare-comparison after string truncation
Substr_count-calculates the number of occurrences of a character segment in a string
Substr_replace-replace some characters in the string
Substr-truncates a string
Trim-removes spaces or specified characters on both sides of the string
Ucfirst-converts the first letter of the given string into uppercase letters.
Ucwords-converts the first letter of each English word of the given string into uppercase letters.
Vfprintf-return data as required and directly write data to the document stream
Vprintf-display data as required
Vsprintf-return data as required, but no output
Wordwrap-splits a string based on a certain character length
The strtolower () function converts all characters into lowercase letters, and the strtoupper () function converts all characters into uppercase letters. the ucfirst () function converts the first letter of the given string to uppercase letters, ucwords () the function converts the first letter of each English word to uppercase. Ucfirst () only processes the first character of a string, ucwords () only processes the first letter of each word (it is determined by space whether it is a word, "today! "Hi" and "today. Hi" are considered as a word.) the case sensitivity of other letters does not change.
For more information, see:
PHP character functions