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PHP中函数内引用全局变量的方法_php技巧

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2016-05-17 09:34:361571browse

PHP中函数内引用全局变量的方法_php技巧

先看下面的代码:

 代码如下:

<?php 
$var1 = "#####"; 
$var2 = "&&&&&"; 
function global_references($use_globals) 
{ 
global $var1, $var2; 
if (!$use_globals) { 
$var2 =&$var1; //1 
} else { 
$GLOBALS["var2"] =&$var1; //2 
} 
} 
global_references(false); 
echo "var2 is set to &#39;$var2&#39;
"; 
global_references(true); 
echo "var2 is set to &#39;$var2&#39;
"; 
?>

输出的结果如下:

var2 is set to &#39;&&&&&&#39; 
var2 is set to &#39;#####&#39;

可见,上面的代码中: 

$var2 =&$var1; //1


只对函数内部可见。

$GLOBALS["var2"] =&$var1; //2


在全局范围内可见。

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