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uphp:functions:fread [2017/04/04 13:21] jeff |
uphp:functions:fread [2021/09/13 05:57] (current) |
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| - | Return | + | Read bytes from a file, stream |
| ====Description==== | ====Description==== | ||
| - | <well size=" | + | <well size=" |
| - | <span style=" | + | <span style=" |
| - | < | + | <span style=" |
| <span style=" | <span style=" | ||
| <span style=" | <span style=" | ||
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| </ | </ | ||
| - | This function attempts to read a specified number of bytes from a file or stream. If less than the number of bytes are available it will return the available data. If no data is available it will return an empty string. | + | This function attempts to read a specified number of bytes from a file, stream |
| ====Parameters==== | ====Parameters==== | ||
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| ====Return Values==== | ====Return Values==== | ||
| - | * < | + | * < |
| - | * The length of the returned | + | * < |
| - | * < | + | * < |
| ====Example==== | ====Example==== | ||
| - | **Read the 32 byte MD5 hash from file /md5.txt:** | + | ===Read the 32 byte MD5 hash from file /md5.txt=== |
| <code php> | <code php> | ||
| Line 50: | Line 50: | ||
| ====See Also==== | ====See Also==== | ||
| - | [[fgets()]] - Return a single line from a file or stream, with optional size limit | + | [[fopen()]] - Open a file for reading |
| - | [[fwrite()]] - Write data to a file or stream | + | [[fseropen()]] - Open the serial port at the specified baud rate with optional parameters |
| + | |||
| + | [[f485open()]] - Open the RS-485 port at the specified baud rate and parity | ||
| [[fsockopen()]] - Open an internet socket connection with optional timeout | [[fsockopen()]] - Open an internet socket connection with optional timeout | ||
| - | [[fopen()]] - Open a file for reading | + | [[fgets()]] - Return a single line from a file, stream |
| - | [[f485open()]] - Open the RS-485 port at the specified baud rate and parity | + | [[fwrite()]] - Write data to a file, stream or socket |
| - | [[fseropen()]] - Open the serial port at the specified baud rate with optional parameters | + | [[feof()]] - Test if no more data is available in a file, stream or socket |
| - | [[fclose()]] - Close a file, stream or socket | + | [[filesize()]] - Return the size of a file, or the number of unread bytes in a stream or socket |
| [[fseek()]] - Position the file pointer in an open file | [[fseek()]] - Position the file pointer in an open file | ||
| [[ftell()]] - Return the current position of a file read/write pointer | [[ftell()]] - Return the current position of a file read/write pointer | ||
| + | |||
| + | [[fclose()]] - Close a file, stream or socket | ||