foreach其他数组中的数组集元素中的空元素

Question

i am fetching some $_POST vars and put them in an array likes this:

foreach (array_keys($_POST) as $key) {
    $clean[$key] = mysql_real_escape_string($_POST[$key]);
}

the result is an array like this:

Array
(
    [pers_anrede] => Frau
    [pers_titel] => Dr.
    [pers_vorname] => BLa
    [pers_nachname] => blablabla
    [pers_vorwahl] => 0123
    [pers_telefon] => 3456789
    [job_bundesland] => Berlin
    [job_plz] => 
    [job_ort] => 
    [job_str] => 
)

now, what i want to do is some form of simple validation. if an element of the array above has any value, its error is set to false. if a value for the element is missing, its error is set to true. i would like to get an array like this (keeping the example data from above, only the last three elements would produce an error:

Array
(
    [pers_anrede] => false
    [pers_titel] => false
    [pers_vorname] => false
    [pers_nachname] => false
    [pers_vorwahl] => false
    [pers_telefon] => false
    [job_bundesland] => false
    [job_plz] => true
    [job_ort] => true
    [job_str] => true
)

with this array i want to be able to do things like this etc:

if $error['pers_anrede'] == true {
      $error_message = 'please correct blabla';
}

thanks for helping out

Answer 1

This will loop through your clean array's keys and load an error array that stores true if they are empty:

foreach ( array_keys( $clean ) as $key )
    $error[$key] = empty( $clean[$key] );

or if you don't want to use array keys:

foreach ( $clean as $key => $value )
    $error[$key] = empty( $value );