PHP4.x 下自定义函数 file_put_contents , 完全模拟 - 天空小小岛技术网站

<?php
//note 兼容 PHP 4 无 file_put_contents 函数
if (!function_exists('file_put_contents')) {
function file_put_contents($filename, $content, $flags = null, $resource_context = null) {
//note 数组转成字符串
if (is_array($content)) {
$content = implode('', $content);
}
//note 写入的数据必须是标量
if (!is_scalar($content)) {
trigger_error('file_put_contents(): supplied resource is not a valid stream resource', E_USER_WARNING);
return false;
}
//note 获取数据长度
$length = strlen($content);
//note 确定写入模式
$mode = ($flags & FILE_APPEND) ? $mode = 'a' : $mode = 'w';
//note 检查是否使用内置路径
$use_inc_path = ($flags & FILE_USE_INCLUDE_PATH) ? true : false;
//note 打开文件准备写入
if (($fh = @fopen($filename, $mode, $use_inc_path)) === false) {
trigger_error('file_put_contents(): failed to open stream: Permission denied', E_USER_WARNING);
return false;
}
//note 写入文件
$bytes = 0;
if (($bytes = @fwrite($fh, $content)) === false) {
$errormsg = sprintf('file_put_contents() Failed to write %d bytes to %s', $length, $filename);
trigger_error($errormsg, E_USER_WARNING);
return false;
}
//note 关闭
@fclose($fh);
//note 检查写入是否正常
if ($bytes != $length) {
$errormsg = sprintf('file_put_contents(): Only %d of %d bytes written, possibly out of free disk space.', $bytes, $length);
trigger_error($errormsg, E_USER_WARNING);
return false;
}
//note 返回写入到文件内数据的字节数
return $bytes;
}
}
?>

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