PHP array and string conversion implementation method

$array=explode(separator,$string); 
$string=implode(glue,$array);

The key to using and understanding these two functions is the relationship between separator and glue. When converting an array to a string, glue characters - characters or codes that will be inserted between the array values ​​in the resulting string - are set.

In contrast, when converting a string to an array, you specify a delimiter, which is used to mark what should become independent array elements. For example, start with a string:

$s1='Mon-Tue-Wed-Thu-Fri';
$days_array=explode('-',$ s1);
The $days_array variable is now an array with 5 elements, where the index of Mon is 0, the index of Tue is 1, and so on.
　$s2=implode(',',$days_array);
　$s2
The variable is now a comma-separated list of days of the week: Mon, Tue, Wed, Thu, Fri

Example 1. explode() example

<?php 
// 示例 1 
$pizza = "piece1 piece2 piece3 piece4 piece5 piece6"; 
$pieces = explode(" ", $pizza); 
echo $pieces[0]; // piece1 
echo $pieces[1]; // piece2 
// 示例 2 
$data = "foo:*:1023:1000::/home/foo:/bin/sh"; 
list($user, $pass, $uid, $gid, $gecos, $home, $shell) = explode(":", $data); 
echo $user; // foo 
echo $pass; // * 
?>

Example 2. limit parameter example

<?php 
$str = &#39;one|two|three|four&#39;; 
// 正数的 limit 
print_r(explode(&#39;|&#39;, $str, 2)); 
// 负数的 limit 
print_r(explode(&#39;|&#39;, $str, -1)); 
?>

The above example will output:
Array
(
[0 ] => one
[1] => two|three|four
)
Array
(
[0] => one
[1] => two
[2] => three
)

Note: This function can be used safely for binary objects.

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