Explanation of several character processing functions in php_PHP tutorial

String splitting and concatenation functions:

Code:
array explode(string delimiter, string data)

Use string dellimiter to split data into an array and return it
Similar functions: split()

Code:
string implode(array data, string dellimiter)

The function is exactly the opposite of explode(). It uses dellimiter to connect the array into a long string
Function alias: join()

Code:
array split(string pattern, string text[, integer limit])

Use characters matching pattern as delimiters to split the string text into arrays
limit optional parameter, limiting the number of segments

String encoding and decoding function:

Code:
string addslashes(string text)

Add "" before the special characters in the string text to return. Special characters include (), ("), ().
Similar functions: quotemeta()

Code:
string stripslashes(string text)

Just the opposite of addslashes() function, remove the backslash encoding

Code:
string quotemeta(string text)

Similar to addslashes(), the difference is that its special characters include: . + * ? [ ] ^ ( ) $

Code:
string escapeshellcmd(string command)

Add a backslash before any characters that may cause trouble in shell commands.
Used before exec(), system() and other functions.

Code:
string mysql_escape_string(string text)

Escape an SQL string to make it safe for use with mysql_query()

HTML related functions

Code:
string htmlentities(string text)

Convert all HTML entities

Code:
string htmlspecialchars (string string [, int quote_style [, string charset]])

Convert specific characters to HTML entities
quote_style: (ENT_COMPAT|ENT_QUOTES)
quote_style default value: ENT_COMPAT conversion& < >
When quote_style is: ENT_QUOTES, in addition to converting the above characters, " and

are also converted

Code:
string trim(string text)

Remove the null characters at the beginning and end of the string text

Code:
string ltrim(string text)

Remove the null character at the beginning of the string text

Code:
string rtrim(string text)

Remove the null character at the end of the string text

Code:
string chop(string text)

Alias ​​of function rtrim()

http://www.bkjia.com/PHPjc/486552.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/486552.htmlTechArticleString splitting and connecting functions: Code: array explode(string delimiter, string data) Use string dellimiter to put data Split into an array and return a similar function: split() code...