Q: PHP: remove string character found in another string I am trying to compare two strings and remove any characters that appear in second string.
For example:
$stringA="abcdefg" ;
$stringB="ayfcghifh" ;

I want $stringB to be "yhih". Are there any ways to do it? 
Thanks for the help...

A: str_replace(str_split($stringA),'',$stringB);


A: echo ereg_replace("[" . $stringA . "]", "", $stringB);
would be a convenient way to do so.

Or using preg_replace()
$stringB = preg_replace('/[' . preg_quote($stringA, '/') . ']/', '', $stringB);

As an added benefit, you can have case-insensitivity with the /i modifier and Unicode support with /u.

A: You can use multiple needles in str_replace() to remove each character from $stringA. Assuming we're talking about single-byte encoding, you can use str_split() to separate each character, which gives you:
$stringB = str_replace(str_split($stringA, 1), '', $stringB)

