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php函数中使用static

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Release: 2016-06-13 10:49:54
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function sendHeader($num, $rtarr = null) {
    static $sapi = null;
    if ($sapi === null) {
        $sapi = php_sapi_name();
    }
    return $sapi++;
  看PW源码的时候发现setHeader()函数中使用static关键字,很奇怪,以前也没这样用过。
static用在函数里面,声明一次变量后,如果再次调用这个函数将会在初始值延续,如$sapi这里将累加。

echo sendHeader(1)."
";
echo sendHeader(2)."
";
echo sendHeader(3)."
";
  output:

apache2handler
apache2handles
apache2handlet
  和global有点类似,但不同的是作用域。static只能作用于此函数。
有点意思。需要深入研究。

 

 

摘自 zaric

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