php addslashes sql anti-injection function_PHP tutorial

addslashes can automatically add single quotes and double quotes, so that we can safely store data in the database without being exploited by hackers. *///The parameter 'A..z' defines that all uppercase and lowercase letters are escaped echo addcslashes('foo[ ]','A..z'); //Output: foo[ ] ​

addslashes can automatically add single quotes and double quotes, so that we can safely store data in the database tutorial without being exploited by hackers.
*/
//The parameter 'a..z' defines that all uppercase and lowercase letters are escaped
echo addcslashes('foo[ ]','a..z'); //Output: foo[ ]

//
$str="is your name o'reilly?"; //Define string, including characters that need to be escaped
echo addslashes($str); //Output the escaped string

/*
Definition and Usage
The addslashes() function adds a backslash before the specified predefined characters.

These predefined characters are:

Single quote (')
Double quotes (")
backslash ()
null
Grammar
addslashes(string)
*/

//Of course this function is safer

$str="test"; //Define a string containing special characters
$new=htmlspecialchars($str,ent_quotes); //Perform conversion operation
echo $new; //Output the conversion result
//But you need to use

when outputting

$str="jane & 'tarzan'"; //Define html string
echo html_entity_decode($str); //Output the converted content
echo "
";
echo html_entity_decode($str,ent_quotes); //Content output with optional parameters

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