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新增 Generators

Support for generators has been added via the yield keyword. Generators provide an easy way to implement simple iterators without the overhead or complexity of implementing a class that implements the Iterator interface.

A simple example that reimplements the range() function as a generator (at least for positive step values):

  <?php
 function  xrange ( $start ,  $limit ,  $step  =  1 ) {
    for ( $i  =  $start ;  $i  <=  $limit ;  $i  +=  $step ) {
         yield $i ;
    }
}

echo  'Single digit odd numbers: ' ;

  
 foreach ( xrange ( 1 ,  9 ,  2 ) as  $number ) {
    echo  " $number  " ;
}
 ?>

以上例程会输出：

Single digit odd numbers: 1 3 5 7 9

新增 finally 关键字

try-catch blocks now support a finally block for code that should be run regardless of whether an exception has been thrown or not.

foreach 现在支持 list()

foreach 控制结构现在支持通过 list() 构造将嵌套数组分离到单独的变量。例如：

  <?php
$array  = [
    [ 1 ,  2 ],
    [ 3 ,  4 ],
];

foreach ( $array  as list( $a ,  $b )) {
    echo  "A:  $a ; B:  $b \n" ;
}
 ?>

以上例程会输出：

A: 1; B: 2
A: 3; B: 4

关于 foreach 更深入的文档可参考相关手册页面。

empty() 支持任意表达式

empty() 现在支持传入一个任意表达式，而不仅是一个变量。例如：

  <?php
 function  always_false () {
    return  false ;
}

if (empty( always_false ())) {
    echo  'This will be printed.' ;
}

if (empty( true )) {
    echo  'This will not be printed.' ;
}
 ?>

以上例程会输出：

This will be printed.

array and string literal dereferencing

Array and string literals can now be dereferenced directly to access individual elements and characters:

  <?php
 echo  'Array dereferencing: ' ;
echo [ 1 ,  2 ,  3 ][ 0 ];
echo  "\n" ;

echo  'String dereferencing: ' ;
echo  'PHP' [ 0 ];
echo  "\n" ;
 ?>

以上例程会输出：

Array dereferencing: 1
String dereferencing: P

新的密码哈希 API

A 新的密码哈希 API that makes it easier to securely hash and manage passwords using the same underlying library as crypt() in PHP has been added. See the documentation for password_hash() for more detail.

Apache 2.4 handler supported on Windows

The Apache 2.4 handler SAPI is now supported on Windows.

改进 GD

对 GD 扩展做了多方面的改进，包括：

翻转支持使用新的 imageflip() 函数。
高级裁剪支持使用 imagecrop() & imagecropauto() 函数。
WebP 的读写分别支持使用 imagecreatefromwebp() & imagewebp() 。

用户评论:

[#1] Anonymous [2015-10-12 10:38:15]

Dereferencing still doesn't work over multiple layers.
Stuff like $function()[0]()[0]() causes syntax errors.

[#2] Anonymous [2015-04-14 16:53:18]

Yield is awesome... it's starts to look like a real language now ;-)

class myList {
    public $list;
    public function __construct($list) {
        $this->list = $list;
    }

    public function select(...$keys) {
        $keys_array = array_fill_keys($keys, null);
        $items = $this->list;
        foreach($items as $item) {
            yield array_merge($keys_array, array_intersect_key($item, $keys_array));
        }
    }
}

[#3] er dot ankitvishwakarma at gmail dot com [2014-09-17 16:48:43]

All the new features are incredible. I had always been waiting for such things to be happened.

[#4] mykolas dot sirius at gmail dot com [2014-04-02 08:10:32]

Finally, array and string literal dereferencing is here, bless you all!

[#5] yannicschne at gmail dot com [2014-04-01 11:34:52]

The array and string dereferencing is awesome! Thanks for this.

[#6] Love this [2014-01-23 18:45:47]

Thanks for making "empty" easier to use and for the array dereferencing!!

[#7] emanwebdev at gmail dot com [2013-12-17 10:51:07]

Thank You for making empty() to support arbitrary expressions!

[#8] PHP Guy [2013-11-07 17:59:26]

Great work. Thank you for allowing Lists to return on foreach.