文件内容替换, 锁文件方式

file_line_replace.php

 <?php
 
/**
 * 文件行扫描, 按callback 替换
 * @param string $file
 * @param callable $findCallback
 * @param bool $loop
 */
function file_line_replace($file, callable $findCallback, $loop = false)
{
    $h = fopen($file, 'cr+');

    flock($h, LOCK_EX);
    $size = fstat($h)['size'];
    $newContents = [];
    $find = false;
    $cSize = $pos = 0;

    while (!feof($h)) {
        $content = $tmpContent = fgets($h);
        $content = trim($content, "\n");

        if ($loop) {
            if ($content) {
                $find = $findCallback($content) || $find;
                $newContents[] = $content;
            }
        } else {
            if (!$find) {
                $find = $findCallback($content);
                if ($find) {
                    $newContents[] = $content;
                    $cSize = strlen(trim($tmpContent, "\n")) - strlen($content);
                    $pos = ftell($h) - strlen($tmpContent);
                }
            } else {
                $newContents[] = $content;
            }
        }
    }

    if ($find) {
        $newContents = implode("\n", $newContents) . "\n";

        fseek($h, $pos);
        fwrite($h, $newContents);

        if ($loop) {
            ftruncate($h, strlen($newContents));
        } else {
            ftruncate($h, $size - $cSize);
        }
    }

    flock($h, LOCK_UN);
    fclose($h);
}

//"/tmp/tmp.txt" content
/*
abcdef abcdef
abcdef abcdef
abcdef abcdef

 */
//替换后
/*
bbcdef bbcdef
bbcdef bbcdef
bbcdef bbcdef

 */
file_line_replace(
    "/tmp/tmp.txt",
    function (&$content) {
        $content = str_replace('a', 'b', $content);
        return true;
    },
    true
);