The difference between PHP object array and general array

foreach in PHP is a frequently used function and is often used to traverse arrays. For situations where the elements in the array are values ​​(such as common types of arrays), foreach just adds each element in the array to The value is copied to the variable after each, which is a copy of the value itself. Changing its value will not affect the array itself.

## Such as: (Recommended learning: PHP video tutorial)

$arr = array(1, 2, 3);

foreach($aa as $el){
    $el =+ 100;
}
 
foreach($arr as $el){
    echo $el;
    echo "<br/>";
 }    // 结果：1 2 3

But if it is an object array, that is, when the array elements are all objects, the variable after each is a copy of the object reference, and changes to it will directly affect the original array itself. This is easily confused with the above situation.

Such as:

$aa = new stdClass();
$aa->name = '张三';

$bb = new stdClass();
$bb->name =  '李四';

$arr = array($aa, $bb);

foreach($arr as $element){
    $element->name = 'qqyumidi';
}

foreach($arr as $el){
    echo $el->name;
    echo "<br/>";
}      // 结果：qqyumidi   qqyumidi

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