Several applications of PHP explode() function_PHP tutorial

explode() function introduction

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

Syntax: explode(separator,string,limit).

• 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.

The 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 negative, all but the last -limit elements are returned. This feature is new in PHP 5.1.0.

Program List: explode() example

    
<?php
// Example 1
$fruit  = "Apple Banana Orange Lemon Mango Pear";
$fruitArray = explode(" ", $fruit);
echo $fruitArray[0]; // Apple
echo $fruitArray[1]; // Banana
// Example 2
$data = "gonn:*:bkjia:1000::/home/foo:/bin/sh";
list($user, $pass, $uid, $gid, $gecos, $home, $shell) = explode(":", $data);
echo $user; // gonn
echo $pass; // *
?>

Program execution result:

Apple
Banana
gonn
*

Program List: Example of explode() using limit parameter

    
<?php
$str = 'one|two|three|four';
// positive limit
print_r(explode('|', $str, 2));
// negative limit (since PHP 5.1)
print_r(explode('|', $str, -1));
?>

Program execution result:

Array 
( 
	[0] => one 
    [1] => two|three|four 
) 
Array 
( 
	[0] => one 
    [1] => two 
    [2] => three 
)

Program List: Convert string into key value array

    
<?php
// converts pure string into a trimmed keyed array
function string2KeyedArray($string, $delimiter = ',', $kv = '=>') {
  if ($a = explode($delimiter, $string)) { // create parts
    foreach ($a as $s) { // each part
      if ($s) {
        if ($pos = strpos($s, $kv)) { // key/value delimiter
          $ka[trim(substr($s, 0, $pos))] = trim(substr($s, $pos + strlen($kv)));
        } else { // key delimiter not found
          $ka[] = trim($s);
        }
      }
    }
    return $ka;
  }
} // string2KeyedArray
$string = 'a=>1, b=>23, $a, c=>45%, true, d=>ab c';
print_r(string2KeyedArray($string));
?>

Program execution result:

Array 
( 
	[a] => 1 
    [b] => 23 
    [0] => $a 
    [c] => 45% 
    [1] => true 
    [d] => ab c 
)

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