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<?php
$str = "Hello world. (can you hear me?)";
echo quotemeta($str);
?>

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quotemeta(string)
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<?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($str1)."<br>";
echo quotemeta($str2)."<br>";
echo quotemeta($str3)."<br>";
echo quotemeta($str4)."<br>";
echo quotemeta($str5)."<br>";
?>

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