PHP中函数内引用全局变量的方法

  •   2009-07-31/23:01
  • 先看下面的代码:

    <?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 '$var2'<br/>";
    global_references(true);
    echo "var2 is set to '$var2'<br/>";
    ?>

    输出的结果如下:
    var2 is set to '&&&&&'
    var2 is set to '#####'
    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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