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empty函数

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Release： 2016-06-06 19:34:50
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empty对一下数据的判断是否为空. 无 ?php $str = ''; $str1 = null; $str2; $str3 = array(); $str4 = false; $str5 = 0; if (empty($str)) { echo "true"; //输出true } if (empty($str1)) { echo "true"; //输出true } if (empty($str2)) { echo "true"; //

empty对一下数据的判断是否为空.
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