PHP implements explore() function sample code-PHP Tutorial-php.cn

PHP implements explore() function sample code

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Release： 2023-03-13 21:46:02

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

Syntax

explode(separator,string,limit)

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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

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>";
?>

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Supports limit to be negative. . The delimiter is string

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