php addslashes escape method

php addslashes escape method: first create a PHP sample file; then define a string; finally add backslashes to the predefined characters in the string through "addslashes($str)".

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

addslashes definition and usage

addslashes() function returns a string with backslashes added before predefined characters.

The predefined characters are:

Single quote (')

Double quote (")

Backslash (\ )

NULL

Tip: This function can be used to prepare strings for strings stored in the database and database query statements.

Note: By default, PHP GET, POST and COOKIE data automatically runs addslashes(). So you should not use addslashes() on escaped strings, as this will cause double-level escaping. When encountering this situation, you can use the function get_magic_quotes_gpc() Perform detection.

Syntax

addslashes(string)

Parameters

string Required. Specifies the string to be escaped.

Technical details

Return Value: Returns the escaped string.

PHP Version: 4

Example

Add backslash to predefined characters in a string Bar:

<?php
$str = "Who&#39;s Bill Gates?";
echo $str . " This is not safe in a database query.<br>";
echo addslashes($str) . " This is safe in a database query.";
?>

Output:

Who's Bill Gates? This is not safe in a database query.
Who\'s Bill Gates? This is safe in a database query.

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