PHP:如何获取 preg_match_all 的字符串索引？

Question

假设我有两个正则表达式，

/eat (apple|pear)/
/I like/

和文字

"I like to eat apples on a rainy day, but on sunny days, I like to eat pears."

我想要的是用preg_match得到如下索引:

match: 0,5 (I like)
match: 10,19 (eat apples)
match: 57,62 (I like)
match: 67,75 (eat pears)

有没有什么方法可以使用 preg_match_all 获取这些索引，而无需每次都循环遍历文本？

编辑:解决方案 PREG_OFFSET_CAPTURE !

Answer 1

您可以尝试为 preg_match() 设置 PREG_OFFSET_CAPTURE 标志:

$subject="I like to eat apples on a rainy day, but on sunny days, I like to eat pears.";
$pattern = '/eat (apple|pear)/';
preg_match($pattern, $subject, $matches, PREG_OFFSET_CAPTURE );
print_r($matches);

输出

$ php test.php
Array
(
    [0] => Array
        (
            [0] => eat apple
            [1] => 10
        )

    [1] => Array
        (
            [0] => apple
            [1] => 14
        )

)