In passing a parameter to a function or method, type declaration or hinting can be useful to ensure the correct parameter type is passed to the function. For example, a requirement to pass an array involves placing the word array in front of the parameter.
Create a file named typeDeclaration.php and insert the following code.
PHP:
<?php
function testType(array $myArray) {
var_dump($myArray);
}
$anyArray = array(5,6,7);
$test = testType($anyArray);
echo '<h2>Another Test</h2>';
$noArray = 1;
$buggeredTest = testType($noArray);Run this in the file in the browser. You should get something similar to these messages.
The first var_dump works as expected because an array is being passed. The second test is not using an array and a Catchable fatal error is produced.
The PHP manual provides a listing of type declarations and the PHP versions required to use them.
