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<?php $_POST=['submit'=>'','firstname'=>'legit','lastname'=>'n0tl3g!t']; $errors=[]; foreach($_POST as $key=>$value){ if(in_array($key,['firstname','lastname']) && !ctype_alpha($value)){ $errors[]="$key field contains invalid value: $value"; } } var_export($errors);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 'lastname field contains invalid value: n0tl3g!t', )

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