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    <p>I ended up using a custom solution inspired by the answer of @VolkerK. I should have stated clearer what I wanted. I've update my question with this information.</p> <p>I'm still looking for an easier solution.</p> <p>First, I made some result arrays:</p> <pre><code>// errors to display $errors = array(); // fields to ignore in the validation step $ignore_fields = array(); // return values after validation $returnvalues = array(); </code></pre> <p>I first filtered for required fields:</p> <pre><code>function required($string){ return trim($string) == "" ? false : $string; } $required_errors = array( "firstname" =&gt; "Je moet je voornaam invullen.", "lastname" =&gt; "Je moet je achternaam invullen.", "email" =&gt; "Je moet je e-mailadres invullen." ); $required_filter = array(); foreach($required_errors as $requiredfieldname =&gt; $error){ $required_filter[$requiredfieldname] = array( 'filter' =&gt; FILTER_CALLBACK, 'options' =&gt; "required", 'flags' =&gt; FILTER_NULL_ON_FAILURE ); } $required_filtered = filter_input_array(INPUT_GET | INPUT_POST, $required_filter); foreach($required_errors as $required =&gt; $error){ if(!isset($required_filtered[$required])){ $errors[$required] = $required_errors[$required]; $returnvalues[$required] = ""; $ignore_fields[$required] = "ignored"; // value doesn't matter } } </code></pre> <p>Then check for the empty fields and load them with a standard value</p> <pre><code>// ignore the other fields if they are empty; // the actual form has about 10 values here $maybeempty = array("from", "to", "phonenumber"); $optional_defaultvalue = array( "from" =&gt; 0, "to" =&gt; 0, "phonenumber" =&gt; "", ); $optional_filter = array(); foreach($maybeempty as $field){ $required_filter[$requiredfieldname] = array( 'filter' =&gt; FILTER_CALLBACK, 'options' =&gt; "required", 'flags' =&gt; FILTER_NULL_ON_FAILURE ); } $optional_filtered = filter_input_array(INPUT_GET | INPUT_POST, $required_filter); foreach($maybeempty as $field){ if(!isset($optional_filtered[$field])){ $ignore_fields[$field] = "ignored"; // value doesn't matter $returnvalue[$field] = $optional_defaultvalue[$field]; } } </code></pre> <p>In the final step, I will build a validation array, custom error messages and ignore the ignore fields, to skip empty fields or fields that already had an error:</p> <pre><code> $validity_filter = array( 'email' =&gt; array( 'filter' =&gt; FILTER_VALIDATE_EMAIL, 'flags' =&gt; FILTER_REQUIRE_SCALAR ), 'from' =&gt; array( 'filter' =&gt; FILTER_VALIDATE_INT, 'flags' =&gt; FILTER_REQUIRE_SCALAR, 'options' =&gt; array('min_range' =&gt; 1964, 'max_range' =&gt; 2009)), 'to' =&gt; array( 'filter' =&gt; FILTER_VALIDATE_INT, 'flags' =&gt; FILTER_REQUIRE_SCALAR, 'options' =&gt; array('min_range' =&gt; 1964, 'max_range' =&gt; 2009)) ); // filter all ignored fields $validity_filter = array_diff_key($validity_filter, $ignore_fields); $validity_filtered = filter_input_array(INPUT_GET | INPUT_POST, $required_filter); foreach($validity_filter as $field =&gt; $value){ if($value === false){ // NULL values are checked in a previous step $errors[$field] = $validity_errors[$field]; // show error $returnvalues[$field] = $_REQUEST[$field]; // return original value } else { $returnvalues[$field] = $value; // return filtered value } } // process possible errors and response values </code></pre>
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    1. POUsing PHP Filter function to validate, but ignore empty non-required fields
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