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1、ereg — 正则表达式匹配
此函数遇 %00 截断。
<?php $a = $_GET['pwd']; var_dump(ereg ("^[0-9]+$", $a)); ?>
访问:http://localhost/index.php?pwd=123%00abc
2、sha1 — 计算字符串的 sha1 散列值
参数要求是 string,传入数组则返回 NULL。
var_dump(sha1(array(1,2))); //NULL
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