php fgets() 和 fread() - 有什么区别？
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fgets() and fread() - What is the difference?
提问by Alix Axel
回答by Pascal MARTIN
fgetsreads a line-- i.e. it will stop at a newline.
fgets读取一行——即它会停在换行符处。
freadreads raw data-- it will stop after a specified (or default)number of bytes, independently of any newline that might or might not be present.
fread读取原始数据——它将在指定（或默认）字节数后停止，独立于可能存在或不存在的任何换行符。
Speed is not a reason to use one over the other, as those two functions just don't do the same thing :
速度不是使用一个而不是另一个的理由，因为这两个功能只是不做同样的事情：
回答by zloctb
fread() for binary data and fread has a limit on how many chars you can read
fread() 用于二进制数据，并且 fread 对您可以读取的字符数有限制
$source_file = fopen( $filename, "r" ) or die("Couldn't open $filename");
while (!feof($source_file)) {
$buffer = fread($source_file, 5);
var_dump($buffer); //return string with length 5 chars!
}
Number 5 is length bytes have been read .
数字 5 是已读取的长度字节。
回答by Pritom Das
The function fgets reads a single line from a text file. It is reading so long until the end of the current line (or the end of the file) is reached. Therefore, if you would like to read one line from a text file, you should use fgets. The function fread not only reads until the end of the line but to the end of the file [e.g. fread($handle)] or as many bytes as specified as a parameter [e.g. fread($handle, 1024)]. So, if you would like to read a complete file, no matter whether it is a text file with all containing lines or arbitrary raw data from a file, you should use fread.
函数 fgets 从文本文件中读取一行。它正在读取很长时间，直到到达当前行的末尾（或文件的末尾）。因此，如果您想从文本文件中读取一行，您应该使用 fgets。函数 fread 不仅读取到行尾，而且读取到文件末尾 [例如 fread($handle)] 或作为参数指定的字节数 [例如 fread($handle, 1024)]。因此，如果您想读取一个完整的文件，无论是包含所有行的文本文件还是来自文件的任意原始数据，都应该使用 fread。
回答by Abhishek Pai
Both the functions are used to read data from files
这两个函数都用于从文件中读取数据
fgets($filename, $bytes) fgets usually reads $bytes-1 amount of data and stops at a newline or an EOF(end-of-file) whichever comes first. If the bytes are not specified, then the default value is 1024 bytes.
fgets($filename, $bytes) fgets 通常读取 $bytes-1 的数据量并在换行符或 EOF（文件结尾）处停止，以先到者为准。如果未指定字节，则默认值为 1024 字节。
fread($filename, $bytes) fread reads exactly $bytes amount of data and stops only at EOF.
fread($filename, $bytes) fread 准确读取 $bytes 的数据量并且仅在 EOF 处停止。
