php函数的返回值
php函数的返回值.其实php函数可以返回一个或多个值,使用return关键字可以返回一个变量或者一个数组.return会使程序在return处停止,并返回指定的变量.今天举一个例子吧:
实例代码如下:
<?php function she($a, $b, $c) { return array( $c, $b, $a ); } list($x, $y, $z) = she(2, 3, 4); echo '$x=' . $x . '$y=' . $y . '$z=' . $z; ?>
执行结果如:
<?php function add($shu) { return $shu + 1; } echo add(2) . ' '; function she($a, $b, $c) { return array( $c, $b, $a ); } list($x, $y, $z) = she(2, 3, 4); echo '$x=' . $x . ' $y=' . $y . ' $z=' . $z; ?>
php函数,想要传回多个返回值,怎么做到(函数不能返回多个值,但可以通过返回一个数组来得到类似的效果.)
实例代码如下:
<?php function results($string) { $result = array(); $result[] = $string; //原字符串 $result[] = strtoupper($string); //全部换成大写 $result[] = strtolower($string); //全部换成小写 $result[] = ucwords($string); //单词的首字母换成大写 return $result; } $multi_result = results('The quick brown fox jump over the lazy dog'); print_r($multi_result); ?>
输出结果:
Array ( [0] => The quick brown fox jump over the lazy dog [1] => THE QUICK BROWN FOX JUMP OVER THE LAZY DOG [2] => the quick brown fox jump over the lazy dog [3] => The Quick Brown Fox Jump Over The Lazy Dog )
引用,本函数返回三个值,一个是函数返回,两个传引用.
实例代码如下:
<?php function test(&$a, &$b) { $a = 1000; $b = 12000; return $a + $b; } $a = 10; $b = 12; $c = test($a, $b); //注意这里没有 & 了. //显示修改后的值 echo $a; echo $b; echo $c; //这是函数返回值; ?>
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