PHP 如何使用 preg_match 精确匹配字符串中的数字和符号？

Question

我正在解析一些数据并针对我的网站对其进行标准化。我解析得到的数据：

[sizes] => Array
    (
        [0] => 5
        [1] => 6
        [2] => 10
        [3] => 6+
        [4] => 7
        [5] => 7+
        [6] => 8
        [7] => 8+
        [8] => 9
    )

我需要得到：

[0] => US - 5
[1] => US - 6
[2] => US - 10
[3] => US - 6.5
[4] => US - 7.5
[5] => US - 8.5

我尝试了 preg_replace（各种不同的变体）和 str_replace，但似乎没有任何效果。它似乎覆盖了值：

 $sizes[$i]= str_replace("7", "US - 7", $sizes[$i]); 
 $sizes[$i] = preg_replace('/\b6\b/', "US - 6", $sizes[$i]); 
 $sizes[$i] = preg_replace('~6\+$~m', "US - 6.5", $sizes[$i]); 
 $sizes[$i] = preg_replace('~5+$~m', "US - 5.5", $sizes[$i]);

我得到了类似的东西：

        [0] => US - 10
        [1] => US - 5.US - 5
        [2] => US - 6
        [3] => US - 6.US - 5.US - 5
        [4] => US - 7
        [5] => US - 8
        [6] => US - 9
        [7] => US - US - 7.5
        [8] => US - US - 8.5

如果有人能提供帮助，我将不胜感激。谢谢

Answer 1

而不是尝试使用正则表达式并假设常量 'US - x' 并且 + 表示 .5 大小，然后使用 US - 作为前缀并仅替换 + 与 .5 并使用 array_walk() 处理每个元素...

$size = [0 => "5",
    1 => "6",
    2 => "10",
    3 => "6+",
    4 => "7",
    5 => "7+",
    6 => "8",
    7 => "8+",
    8 => "9"];

array_walk($size, function (&$data) { 
                $data = "US - ".str_replace("+", ".5", $data); 
});
print_r($size);

输出...

Array
(
    [0] => US - 5
    [1] => US - 6
    [2] => US - 10
    [3] => US - 6.5
    [4] => US - 7
    [5] => US - 7.5
    [6] => US - 8
    [7] => US - 8.5
    [8] => US - 9
)

你当然可以使用任何类型的循环而不仅仅是array_walk()，主要逻辑是相同的。

Answer 2

这是另一种方法：

<?php

$result = [];
$size = [
    0 => "5",
    1 => "6",
    2 => "10",
    3 => "6+",
    4 => "7",
    5 => "7+",
    6 => "8",
    7 => "8+",
    8 => "9"
];

foreach($size as $key => $value) {
    $result[$key] = "US - " . number_format(floatval($value), 2);
}

echo "<pre>";
print_r($result);
echo "</pre>";

输出：

Array
(
    [0] => US - 5.00
    [1] => US - 6.00
    [2] => US - 10.00
    [3] => US - 6.00
    [4] => US - 7.00
    [5] => US - 7.00
    [6] => US - 8.00
    [7] => US - 8.00
    [8] => US - 9.00
)

PHP 如何使用 preg_match 精确匹配字符串中的数字和符号？

PHP How to match exact numbers and symbols in a string using preg_match?

php

preg-replace

str-replace