这是我的解决方案：
<?php
//give the file (string) to the function
function keepColorBackgroundBorder($input) {
//didn't check if the input was correct (string, not empty, etc)
//we turn the input into an array
$input = explode("\n", $input);
//here is the list of strings which must be in a line to keep it in our final string
$keep = ['{', '}', 'color', 'background', 'border'];
$result = '';
//foreach over the lines of the input
foreach ($input as $key => $value) {
//foreach over each characters we want to keep
foreach ($keep as $key => $value2) {
//if the characters are somewhere in the line
if (strpos($value, $value2) !== false) {
//we add the line + a newline character
$result .= $value . "\n";
//we stop the check for characters as we don't want a line to be included twice
//e.g: border-bottom: 1px solid darken(@rw-header-background-color, 10%);
//this example contains border and background
break;
}
}
}
//we return the result, end delete the last newline character
return trim($result);
}
//we get the file as a string
$input = file_get_contents('file.css');
//we call the function and we look at what was outputted
echo keepColorBackgroundBorder($input);
cmets可能太多了，但是太多总比不够好。
我使用了一个数组，以便您可以轻松更改。例如，您可以使用['background:', 'border:', 'border-bottom:'] 等来确保如果一行在开头以外的位置包含允许的单词，则不包含该行，例如包含background 但不包含background: 的border-bottom: 1px solid darken(@rw-header-background-color, 10%);。
如果file.css 包含：
.header-logo-holder{
display: block;
float: none;
text-align: center;
margin: 10px 0;
color: #fff;
background: #333;
padding-bottom: 15px;
border-bottom: 1px solid darken(@rw-header-background-color, 10%);
.logo{
margin: 0;
}
.eg-clearfix();
}
你会得到：
.header-logo-holder{
color: #fff;
background: #333;
border-bottom: 1px solid darken(@rw-header-background-color, 10%);
.logo{
}
}