PHP implements explore() function sample code

explode() function breaks up the string into an array. Returns an array of strings

Syntax

explode(separator,string,limit)

Parameters	Description
separator	Required. Specifies where to split the string.
string	Required. The string to split.
limit	Optional. Specifies the number of array elements to be returned. Possible values: Greater than 0 - Returns an array containing up to limit elements Less than 0 - Returns an array containing all but the last -limit elements 0 - Returns an array containing one element

#Note: The "separator" parameter cannot be an empty string.

The sample code is as follows:

<?php
/**
 * PHP 实现explort() 功能的详解
 */
$str = &#39;,1,2,3,4,321321,aaa,bbb&#39;;
function myExplode($seg,$str,$limit=0){
   $_ret = array(0=>&#39;&#39;);
   $len = strlen($str);
   $slen = strlen($seg);
   $_limit = 0;
   for($i=0; $i<$len; $i++){
      if(substr($str,$i,$slen) == $seg ){
          $_limit++;
          $i += $slen-1; 
          continue;
      }else{
          $_ret[$_limit] .= $str[$i]; 
      }
   }
   if($limit < 0 )
      $_ret = array_slice($_ret, 0 , $limit );
   else{
      $_ret = $limit >= count($_ret) ? $_ret :  array_merge(array_slice($_ret, 0 , $limit-1 ), array(implode( $seg , array_slice($_ret,$limit-1))));
   }
   return $_ret;
}
var_dump(myExplode("4",$str));
echo "<br>";
var_dump(explode("4",$str));
echo "<br>";
?>

Supports limit to be negative. . The delimiter is string

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