Detailed explanation of the application of explode() function in php-PHP Tutorial-php.cn

Detailed explanation of the application of explode() function in php

黄舟

Release： 2023-03-17 13:14:02

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php, the explode() function splits the string into an array. Its return value is an array composed of strings, each element of which is a substring separated by separator as a boundary point. This article introduces the detailed application of explode() function in PHP!

explode() function introduction

explode() function can split a string into an array.

Syntax:

explode(separator,string,limit)。

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separator, required. Specifies where to split the string.

string, required. The string to split.

limit, optional. Specifies the maximum number of array elements returned.

This function returns an array composed of strings, each element of which is a substring separated by separator as a boundary point.

separator parameter cannot be an empty string. If separator is the empty string (""), explode() returns FALSE. If separator contains a value that is not found in string, explode() returns an array containing a single element from string.

If the limit parameter is set, the returned array contains at most limit elements, and the last element will contain the remainder of the string.

If the limit parameter is a negative number, all elements except the last -limit elements are returned. This feature is new in PHP 5.1.0.

Program List: explode() example

01    <?php    
02    // Example 1    
03    $fruit  = "Apple Banana Orange Lemon Mango Pear";    
04    $fruitArray = explode(" ", $fruit);    
05    echo $fruitArray[0]; // Apple    
06    echo $fruitArray[1]; // Banana    
07    // Example 2    
08    $data = "gonn:*:nowamagic:1000::/home/foo:/bin/sh";    
09    list($user, $pass, $uid, $gid, $gecos, $home, $shell) = explode(":", $data);    
10    echo $user; // gonn    
11    echo $pass; // *    
12    ?>

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Program operation result:

1    Apple    
2    Banana    
3    gonn    
4    *

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Program List: explode() using limit parameter Example

1    <?php    
2    $str = &#39;one|two|three|four&#39;;    
3    // positive limit    
4    print_r(explode(&#39;|&#39;, $str, 2));    
5    // negative limit (since PHP 5.1)    
6    print_r(explode(&#39;|&#39;, $str, -1));    
7    ?>

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Program running result:

01    Array    
02    (    
03        [0] => one    
04        [1] => two|three|four    
05    )    
06    Array    
07    (    
08        [0] => one    
09        [1] => two    
10        [2] => three    
11    )

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Program List: Convert string into key value array

01    <?php    
02    // converts pure string into a trimmed keyed array    
03    function string2KeyedArray($string, $delimiter = &#39;,&#39;, $kv = &#39;=>&#39;) {    
04      if ($a = explode($delimiter, $string)) { // create parts    
05        foreach ($a as $s) { // each part    
06          if ($s) {    
07            if ($pos = strpos($s, $kv)) { // key/value delimiter    
08              $ka[trim(substr($s, 0, $pos))] = trim(substr($s, $pos + strlen($kv)));    
09            } else { // key delimiter not found    
10              $ka[] = trim($s);    
11            }    
12          }    
13        }    
14        return $ka;    
15      }    
16    } // string2KeyedArray    
17    $string = &#39;a=>1, b=>23, $a, c=>45%, true, d=>ab c&#39;;    
18    print_r(string2KeyedArray($string));    
19    ?>

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Program running result:

1    Array    
2    (    
3        [a] => 1    
4        [b] => 23    
5        [0] => $a    
6        [c] => 45%    
7        [1] => true    
8        [d] => ab c    
9    )

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Summary:

This article uses several examples to introduce the application of the explode() function in php in detail, making it more intuitive for everyone Better understanding! Hope it helps with your work!

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