- var_dump: documentation ( source)
<?php
echo '$formData = array();';
echo "\n";
$formData = array();
echo 'empty($formData[\'chain_id\']): ';
var_dump(empty($formData['chain_id']));
echo "\n";
echo '$formData[\'chain_id\'] === \'0\': ';
var_dump($formData['chain_id'] === '0');
echo "\n";
echo "\n";
echo '$formData[\'chain_id\'] = 0;';
echo "\n";
$formData['chain_id'] = 0;
echo 'empty($formData[\'chain_id]\'): ';
var_dump(empty($formData['chain_id']));
echo "\n";
echo '$formData[\'chain_id\'] === \'0\': ';
var_dump($formData['chain_id'] === '0');
echo "\n";
echo "\n";
echo '$formData[\'chain_id\'] = 1;';
echo "\n";
$formData['chain_id'] = 1;
echo 'empty($formData[\'chain_id\']): ';
var_dump(empty($formData['chain_id']));
echo "\n";
echo '$formData[\'chain_id\'] === \'0\': ';
var_dump($formData['chain_id'] === '0');
echo "\n";
echo "\n";