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<?php $separator = ' '; $old_string = 'abc def'; $new_tag = 'def'; $tags = explode($separator, $old_string); $diffTags = array_diff($tags, array($new_tag)); var_dump(implode($separator, $diffTags) . $separator . $new_tag); var_dump($tags == $diffTags);
Output for git.master, git.master_jit, rfc.property-hooks
string(7) "abc def" bool(false)

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