PHP explode()函数的几个应用
explode()函数介绍
explode() 函数可以把字符串分割为数组。
语法：explode(separator,string,limit)。
- separator，必需。规定在哪里分割字符串。
- string，必需。要分割的字符串。
- limit，可选。规定所返回的数组元素的最大数目。
本函数返回由字符串组成的数组，其中的每个元素都是由 separator 作为边界点分割出来的子字符串。
separator 参数不能是空字符串。如果 separator 为空字符串（""），explode() 将返回 FALSE。如果 separator 所包含的值在 string 中找不到，那么 explode() 将返回包含 string 中单个元素的数组。
如果设置了 limit 参数，则返回的数组包含最多 limit 个元素，而最后那个元素将包含 string 的剩余部分。
如果 limit 参数是负数，则返回除了最后的 -limit 个元素外的所有元素。此特性是 PHP 5.1.0 中新增的。
Program List：explode()例子
<?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; // *
?>
程序运行结果：
Apple Banana gonn *
Program List：使用limit参数的explode()例子
<?php
$str = 'one|two|three|four';
// positive limit
print_r(explode('|', $str, 2));
// negative limit (since PHP 5.1)
print_r(explode('|', $str, -1));
?>
程序运行结果：
Array
(
[0] => one
[1] => two|three|four
)
Array
(
[0] => one
[1] => two
[2] => three
)
Program List：将字符串化为键值数组
<?php
// converts pure string into a trimmed keyed array
function string2KeyedArray($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));
?>
程序运行结果：
Array
(
[a] => 1
[b] => 23
[0] => $a
[c] => 45%
[1] => true
[d] => ab c
)
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