如何從字符串而不是數字php中刪除尾隨零

Question

我需要通過刪除結尾的零來更新表。 在一個字符串中。 例如，考慮像琴弦5x115.30 ， 5x115.700 ， 5x115.00 ， 5-115.00 。 我知道floatval函數。 但是它不適用於這樣的字符串。 有任何想法嗎？

Answer 1

preg_replace進行救援...

<?php

$string1 = '5-115.000';
$string2 = '5.030x00115.7010';

$string1 = trim(preg_replace('#(\.[\d]*?)[0]+([\D]|$)#', '$1$2', $string1), '.');
$string2 = trim(preg_replace('#(\.[\d]*?)[0]+([\D]|$)#', '$1$2', $string2), '.');

print_r($string1);
print_r($string2);

輸出：

5-115
5.03x00115.701

正則表達式說明：

\.[\d]*?)[0]+$

\.        => this will ensure we only replace parts which starts with a . (dot)
[\d]*?    => this means any digit such as 0-9, *? makes it optional (any amount of digit can be there or not, it doesn't matter to us)
[0]+      => here we are defining that we match literal 0 . + sign makes it to match multiple zeros
([\D]|$)  => this group indicates either end of the string or any character other than numbers, so we only replace trailing zeros.