What is the difference between arrays and objects in PHP?

In PHP, an array is an ordered sequence, and elements are accessed by index; an object is an entity with properties and methods, created through the new keyword. Array access is via index, object access is via properties/methods. Array values ​​are passed and object references are passed.

Array

An array is an ordered collection where elements are accessed by index. In PHP, arrays are represented using square brackets [], with elements separated by commas.

Create array

$array = ['foo', 'bar', 'baz'];

Access elements

echo $array[0]; // 输出 "foo"

Modify elements

$array[0] = 'new value';

Object

Object is an entity with properties and methods. In PHP, objects are created using the new keyword, followed by the class name.

Create object

$object = new stdClass();

Add attributes

$object->name = 'John Doe';

Call method

echo $object->getName(); // 输出 "John Doe"

Difference

foreach ($array as $element) {
  echo $element . '<br>';
}

foreach ($object as $property => $value) {
  echo "$property: $value<br>";
}

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