The addcslashes() function

This function returns a string with backslashes added before certain characters.

Syntax: addcslashes(string,characters);

characters – the characters before which a backslash is to be added.

Example inputs:

1.
$str1=" my program";
echo $str1;
echo "
";
echo addcslashes($str1,"r");
echo "
";
echo addcslashes($str1,"r,m");

2.
$str1=" my program";
echo $str1;
echo "
";
echo addcslashes($str1,"a...p");

In this case, a backslash is added before every character that falls between a and p in the alphabetical sequence.

3.
$str1=" 121232342434";
echo $str1;
echo "
";
echo addcslashes($str1,"1...3");

Example outputs:

1.
my program my p\rog\ram \my p\rog\ra\m

2.
my program \my \pr\o\gr\a\m

3.
121232342434 \1\2\1\2\3\2\34\24\34