$file = '/abc.php';
$fp = fopen($file, "r");
$line = 30;
$pos = -2;//文件最后一行字符为 \r\n
$t = " ";
$data = [];
while ($line > 0) {
while ($t != "\n") {
if(fseek($fp, $pos, SEEK_END) !== 0){
break;
};
$t = fgetc($fp);
$pos --;
}
$t = " ";
$str = fgets($fp);
if( $str === false){
break;
}
$data[] = $str;
$line --;
}
fclose($fp);
$data = array_reverse($data);
var_dump($data);











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