Learning notes PHP string processing function summary_php tutorial

Learning notes PHP string processing function summary. PHP has been developing for a long time and many users are familiar with PHP. here I will post my personal understanding of PHP string processing functions, hoping to help you, PHP itself is a simple and powerful PHP. after a long period of development, many users know PHP very well. here I will share my personal understanding of PHP string processing functions and hope to help you, PHP itself is a simple and powerful language.

PHP has core features such as powerful string and array processing capabilities, and greatly improved support for object-oriented programming (PHP5 and later versions ). Using standard and optional extension modules, PHP applications can connect to more than a dozen databases such as MySQL or Oracle, draw, create PDF files, and create parsed XML files. You can also use the C language to write your own PHP extension module. For example, provide a PHP interface function in an existing code library. You can also run PHP in Windows, use COM to control other Windows applications such as Word and Excel, or use ODBC to connect to the database, the following is a summary of PHP string processing functions.

Summary of 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 "n"
  
  
"
  
  
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.
 
 

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