给老白写的一个工具函数 PHP打印匹配行

function se_search_line($filename, $pattern)
{
	if (is_readable($filename)) $lines = file($filename);
	else return '';

	$rs = array();

	if (!empty($lines))
	{
		foreach ($lines as $key => $value) {
			if (preg_match($pattern, $value))
			{
				$rs[intval($key) + 1] = $value;
			}
		}
	}

	if ( !empty($rs) )
	{
		$sp = PHP_SAPI === 'cli' ? "\n" : "<br>";
		foreach ($rs as $line => $value) {
			//echo "#line: {$line}#{$sp}";
			echo "{$value}";
		}
	}
}

// demo
se_search_line(__FILE__, "/lines/");