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Detailed explanation of the application of explode() function in php
Detailed explanation of the application of explode() function in php
In
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)。
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 ?>Program operation result:
1 Apple 2 Banana 3 gonn 4 *
Program List: explode() using limit parameter Example
1 <?php 2 $str = 'one|two|three|four'; 3 // positive limit 4 print_r(explode('|', $str, 2)); 5 // negative limit (since PHP 5.1) 6 print_r(explode('|', $str, -1)); 7 ?>
Program running result:
01 Array 02 ( 03 [0] => one 04 [1] => two|three|four 05 ) 06 Array 07 ( 08 [0] => one 09 [1] => two 10 [2] => three 11 )
Program List: Convert string into key value array
01 <?php
02 // converts pure string into a trimmed keyed array
03 function string2KeyedArray($string, $delimiter = ',', $kv = '=>') {
04 if ($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 = 'a=>1, b=>23, $a, c=>45%, true, d=>ab c';
18 print_r(string2KeyedArray($string));
19 ?>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 )
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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