二进制包大于125M后运行不起来

<?php
// 设置你需要的INI配置
$myini = "
memory_limit = 1024M
"
$f=fopen("myiniheader.bin", "wb");
fwrite($f, "\xfd\xf6\x69\xe6");
fwrite($f, pack("N", strlen($myini)));
fwrite($f, $myini);
fclose($f);