How to loop through $_POST passing each post field as a parameter to a function?Edit [closed]

Answer 1

One sample loop to get both the array keys & values:

foreach( $_POST as $key => $value )
{

    isvalid( $key, $value );

}

... so you need to change your isvalid() function to accept two parameters if you need to get the field1, field2, etc.

EDITED

$errors = array();    

foreach( $_POST as $key => $value )
    if ( empty( $value ) ) $errors[] = $key;

if ( !empty( $errors ) )
    echo 'You have errors on: <pre>' . print_r( $errors, true ) . '</pre>';

... you can cancel the submit if $errors is not empty.

Answer 2

Try this

foreach($_POST as $fieldName => $fieldValue) 
{
 isvalid($fieldValue);
}

Answer 3

With foreach, you don't have to know the names of the keys in the array.

foreach($_POST as $key => $field) {
    isvalid($field);
}

$key contains the names like "field1", "field2" and so on while $field contains the value inside the $_POST array. The foreach loop will then run the function invalid() on each of the field value.

To check if the field values are set:

// Sample $_POST array
$_POST = array(
    "field1" => "", // this is not set
    "field2" => "data"
);
foreach($_POST as $key => $field) {
    // You can check if it is empty using foreach alone
    if (strlen($field) > 0) {
        // this field is set
    } else {
        // this field is not set
    }
}

You can use empty() as well but it treats "0" as empty so be careful.

Answer 4

Assuming that you are tyring to create a validation function named as isvalid;

function isvalid($input) {
    return ('' !== trim($input));
}

// loop
$errors = arrray();
foreach ($_POST as $key => $value) {
    if (!isvalid($value)) {
        $errors[] = "$key not be empty!";
    }
}
print_r($errors);

Meanwhile, if $_POST input is not isset, then it won't be in foreach.