$result = preg_grep($pattern,file($path));

见preg_grep^­Docs和file^­Docs.

如果您需要(递归地)对一组文件执行此操作,还有glob和foreach或(递归)DirectoryIterator或GlobIterator^­Docs,而不是忘记RegexIterator^­Docs.

SplFileObject和RegexIterator的示例：

$stream = new SplFileObject($file); 
$grepped = new RegexIterator($stream,$pattern); 

foreach ($grepped as $line) {
    echo $line;
}

输出(包含$pattern的$file的所有行)：

$grepped = new RegexIterator($stream,$pattern); 
foreach ($grepped as $line) {
    echo $line;
}

演示：https://eval.in/208699