PHP: remove string character found in another string

I开发者_C百科 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...

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

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echo ereg_replace("[" . $stringA . "]", "", $stringB);

would be a convenient way to do so.

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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.

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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)