Detailed explanation of the instance usage of PHP functions explode and implode

1. php stringSplit functionexplode()

explode() usage:

array explode(string separator,string string [,int limit])

explode() description:

This function returns an array composed of strings. Each element is a substring of string. They are used as string separators. Boundary points are segmented.

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

If separator is an empty string (""), explode() will return FALSE.

If the value contained in the separator is not found in the string, then explode() will return an array containing a single element of the string.

If the limit parameter is a negative number, all elements except the last limit elements are returned.

explode() example

<?php
//示例 1
$pizza = “piece1 piece2 piece3 piece4 piece5 piece6″;
$pieces = explode(” “, $pizza);
echo $pieces[0]; // piece1
echo $pieces[1]; // piece2
?>

<?php
//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; // *
?>

<?php
//limit 参数示例
$str = ‘one|two|three|four’; // 正数的
limit print_r(explode(‘|’, $str, 2)); // 负数的
limit print_r(explode(‘|’, $str, -1));
?>

The above example will output:

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

Note: This function is safe for use with binary objects.

2. PHP string merging function implode()

implode() usage:

array implode(string separator,string array)

implode() Description:

implode() function combines array elements into a string.

separator is optional. Specifies what is placed between array elements. Default is "" (empty string).

array required.

implode() example:

<?php
$arr = array(‘Hello’,’World!’,’Beautiful’,’Day!’);echo implode(” “,$arr);
?>

Output:

Hello World! Beautiful Day!

Note: implode() can receive two parameter orders; But explode() does not work, you must ensure that the separator parameter precedes the string parameter.

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