PHP7 modified functions

• The scanner_mode parameter of parse_ini_file() and parse_ini_string() adds the INI_SCANNER_TYPED option.
• unserialize() adds a second parameter, which can be used to specify the list of accepted classes. RFC: https://wiki.php.net/rfc/secure_unserialize
• The maximum limit opened by proc_open() was previously hard-coded to 16. Now this limit has been removed. The maximum number depends on what PHP has available. Memory. The Windows version adds the option "blocking_pipes", which can be used to specify whether to force reading in blocks.
• array_column():The function now supports an array of objects as well as two-dimensional arrays
• stream_context_create()windows can receive array("pipe" => array("blocking " => <boolean>)) parameter.
• dirname() adds the option $levels, which can be used to specify the directory level. dirname(dirname($foo)) => dirname($foo, 2);

• When debug_zval_dump() prints, use int instead of long and float instead of double.

PHP filter unserialize()

PHP 7 has added the ability to provide filtering for unserialize() Features can prevent code injection of illegal data and provide safer deserialized data.

Example

<?php
class MyClass1 { 
   public $obj1prop;   
}
class MyClass2 {
   public $obj2prop;
}
$obj1 = new MyClass1();
$obj1->obj1prop = 1;
$obj2 = new MyClass2();
$obj2->obj2prop = 2;
$serializedObj1 = serialize($obj1);
$serializedObj2 = serialize($obj2);
// 默认行为是接收所有类
// 第二个参数可以忽略
// 如果 allowed_classes 设置为 false, unserialize 会将所有对象转换为 __PHP_Incomplete_Class 对象
$data = unserialize($serializedObj1 , ["allowed_classes" => true]);
// 转换所有对象到 __PHP_Incomplete_Class 对象，除了 MyClass1 和 MyClass2
$data2 = unserialize($serializedObj2 , ["allowed_classes" => ["MyClass1", "MyClass2"]]);
print($data->obj1prop);
print(PHP_EOL);
print($data2->obj2prop);
?>

The execution output of the above program is:

1
2