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���� 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: ';

/* ע�Ᵽ�����ڴ��е���������ᱻ�����򷵻� */ 
foreach (xrange(1, 9, 2) as $number) {
    echo "$number ";
}
?>

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Single digit odd numbers: 1 3 5 7 9

���� finally �ؼ���

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 ����֧�� list()

foreach ���ƽṹ����֧��ͨ�� list() ���콫Ƕ��������뵽�����ı��������磺

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

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

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

���� foreach ��������ĵ��ɲο�����ֲ�ҳ�档

empty() ֧��������ʽ

empty() ����֧�ִ���һ��������ʽ����������һ�����������磺

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

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

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

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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";
?>

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Array dereferencing: 1
String dereferencing: P

�µ������ϣ API

A �µ������ϣ 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.

�Ľ� GD

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