注释：该函数是二进制安全的。

语法
quotemeta(string)
string必需。规定要检查的字符串。

<?php
$str1 = "1 + 1 = 2";
$str2 = "1 * 1 = 1";
$str3 = "Could you borrow me 5$?";
$str4 = "Are you not e&";
$str5 = "The caret [ ^ ] Looks like a hat!";

echo quotemeta($str1)."<br>"; // 1 \+ 1 = 2
echo quotemeta($str2)."<br>"; // 1 \* 1 = 1
echo quotemeta($str3)."<br>"; // Could you borrow me 5\$\?
echo quotemeta($str4)."<br>"; // Are you not e&
echo quotemeta($str5)."<br>"; // The caret \[ \^ \] Looks like a hat!
?>