Explore PHP function split () How to use regular expressions to cut strings _php tutorial

For beginners, mastering the usage of common functions in PHP is the basis of their continued learning. Today we will give you a detailed introduction about Description
Array split (string $pattern, string $string [, int $limit])

Tips
The Preg_split () function uses Perl-compatible regular expression syntax, which is usually a faster alternative to split () than the PHP function. If you don't need the power of a regular expression, use explode () faster, so you don't incur the waste of the regular expression engine.

This function returns an array of strings, each of which is a string with a case-sensitive regular expression pattern as a substring of the boundary. If limit is set, the returned array contains a maximum of limit cells, and the last cell contains all the remaining parts of the string. If there is an error, split () returns FALSE.

Split the first four fields in the/etc/passwd:

Example 1839. php function split () example

 
  
  

  
   
   
 Php
  
   
   
List ($user, $pass, $uid, $gid, $extra) = 
  
   
   
Split (":", $passwd _line, 5); 
  
   
   
?>
 
  
  

If there are n items in a string that match pattern, the returned array will contain n+1 cells. For example, if pattern is not found, an array with only one cell is returned. Of course, this is true if the string is empty.

Parse the date that may be split with a slash, dot, or horizontal line:

Example 1840. php function split () example

 
  
  

  
   
   
 Php
  
   
   
The delimiter can be a slash, a dot, or a horizontal line 
  
   
   
$ Date  "04/30/1973"; 
  
   
   
List ($month, $day, $year) = Split (' [/.-] ', $date); 
  
   
   
echo "Month: $month; Day: $day; Year: $year<br/>n "; 
  
   
   
?>
 
  
  

To emulate a similar @chars = Split (", $STR) behavior in Perl, refer to the example in the Preg_split () or Str_split () function.

Note that pattern is a regular expression. If you want to use a split character that is a special character in a regular expression, first escape it. If you feel that the PHP function split () (or any other Regex function) behaves strangely, read the regex.7 file contained in the regex/subdirectory of the PHP release package. This file is a manual page format and can be read with commands like man/usr/local/src/regex/regex.7.

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