streamWrapper::stream_read()

(PHP 4 >= 4.3.2, PHP 5, PHP 7)

Read from stream

说明

This method is called in response tofread()andfgets().

Remember to update the read/write position of the stream (by the number of bytes that were successfully read).

参数

How many bytes of data from the current position should be returned.

返回值

If there are less than$countbytes available, return as many as are available. If no more data is available, return eitherFALSEor an empty string.

错误／异常

调用此方法失败将给出E_WARNING（未实现）。

If the return value is longer then$countanE_WARNINGerror will be emitted, and excess data will be lost.

注释

streamWrapper::stream_eof()is called directly after callingstreamWrapper::stream_read()to check ifEOFhas been reached. If not implemented,EOFis assumed.Warning

When reading the whole file (for example,withfile_get_contents()), PHP will callstreamWrapper::stream_read()followed bystreamWrapper::stream_eof()in a loop but as long asstreamWrapper::stream_read()returns a non-empty string, the return value ofstreamWrapper::stream_eof()is ignored.

参见

• fread() 读取文件（可安全用于二进制文件）
• fgets() 从文件指针中读取一行

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