Question

css造型

<style>
.red { color: red; }
.blue { color: blue;}
</style>

php中的代码

<?php
$string = 'I want a [red]red[/red] apple and a [blue]blue[/blue] umbrella';
$patterns = array();
$patterns[0] = '/[red]/';
$patterns[1] = '/[/red]/';
$patterns[2] = '/[blue]/';
$patterns[3] = '/[/blue]/';
$replacements = array();
$replacements[0] = '<span class="red">';
$replacements[1] = '</span>';
$replacements[2] = '<span class="blue">';
$replacements[3] = '</span>';
echo preg_replace($patterns, $replacements, $string);
?>

但它并没有带我价值，也就是说，不会改变影响。我试过删除＆＃39; \＆＃39;但仍然无法正常工作

Answer 1

我相信模式应该如下......

$patterns[0] = '/\[red\]/';
$patterns[1] = '/\[\/red\]/';
$patterns[2] = '/\[blue\]/';
$patterns[3] = '/\[\/blue\]/';

Answer 2

您需要在正则表达式中转义特殊字符（[或/）。这是工作代码：

<?php
$string = 'I want a [red]red[/red] apple and a [blue]blue[/blue] umbrella';
$patterns = array();
$patterns[0] = '/\[red\]/';
$patterns[1] = '/\[\/red\]/';
$patterns[2] = '/\[blue\]/';
$patterns[3] = '/\[\/blue\]/';
$replacements = array();
$replacements[0] = '<span class="red">';
$replacements[1] = '</span>';
$replacements[2] = '<span class="blue">';
$replacements[3] = '</span>';
echo preg_replace($patterns, $replacements, $string);
// outputs: I want a <span class="red">red</span> apple and a <span class="blue">blue</span> umbrella
?>

你甚至可以更进一步，以更一般的方式编写代码（支持更多颜色，即）：

$string = 'I want a [red]red[/red] apple and a [blue]blue[/blue] umbrella';
$regex = '/\[(red|green|blue)\]([^][]+)\[\/\1\]/i';
// provide an alternative and capture it in the first group
echo preg_replace($regex, "<span class='$1'>$2</span>", $string);

查看示例here。

使用Preg_Replace使用php css将文本替换为其他文本

2 个答案: