使用PHP从字符串中获取数字 [英] Get numbers from string with PHP

问题描述

我有字符串:

$one = 'foo bar 4 baz (5 qux quux)';
$two = 'bar baz 2 bar';
$three =  'qux bar 12 quux (3 foo)';
$four = 'foo baz 3 bar (13 quux foo)';

如何找到这些字符串中的数字?

How can I find the numeric digits in these strings?

也许具有功能:

function numbers($string){

    // ???

    $first = ?;
    $second = ?;
}

例如:

function numbers($one){

    // ???

    $first = 4;
    $second = 5;
}

function numbers($two){

    // ???

    $first = 2;
    $second = NULL;
}

最好的方法可能是正则表达式，但是如何在我的示例中使用它呢?也许没有正则表达式?

Best way for this maybe is regex, but how can I use this for my example? Maybe without regex?

推荐答案

您可以为此使用正则表达式. \d 转义序列将匹配主题字符串中的所有数字.

You can use regular expressions for this. The \d escape sequence will match all digits in the subject string.

例如:

<?php

function get_numerics ($str) {
    preg_match_all('/\d+/', $str, $matches);
    return $matches[0];
}

$one = 'foo bar 4 baz (5 qux quux)';
$two = 'bar baz 2 bar';
$three = 'qux bar 12 quux (3 foo)';
$four = 'foo baz 3 bar (13 quux foo)';

print_r(get_numerics($one));
print_r(get_numerics($two));
print_r(get_numerics($three));
print_r(get_numerics($four));

https://3v4l.org/DiDBL

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