PHP string processing functions

Addcslashes -- add backslash escape characters to some characters in the string
Addslashes -- escape characters in a string in a specified way
Bin2hex -- convert binary data to hexadecimal Representation
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
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.
Html_entity_decode -- the inverse function of the htmlentities () function, which converts an HTML object to a character
Htmlentities -- convert some characters in a string into HTML entities
Htmlspecialchars_decode -- the inverse function of the htmlspecialchars () function, which converts HTML objects to characters.
Htmlspecialchars -- converts 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 difference 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 -- determines the pronunciation rules of a string
Money_format -- format the output of numbers based on parameters
Nl_langinfo -- Query Language and local information
Nl2br -- replace the linefeed "\ n" in the string with "<br/>"
Number_format -- format the output of numbers based on parameters
Ord: converts an ascii code to a character.
Parse_str -- convert a string of a certain format to a variable and a value
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 several specific characters
Rtrim -- remove the white space 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 no output
Sscanf -- you can format strings.
Str_ireplace -- matches and replaces strings like the str_replace () function, but is case insensitive.
Str_pad -- pad both sides of the string
Str_repeat -- repeat the string
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 size of a string
Strcoll-compare the string Size Based on Local Settings
Strcspn -- returns the value of consecutive non-matching lengths.
Strip_tags -- remove the HTML and PHP code in 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 arrange 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
Strspns -- value that matches and returns the consecutive length of a character
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