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uphp:functions:filesize [2017/03/06 12:43] jeff |
uphp:functions:filesize [2021/09/13 05:57] (current) |
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======filesize====== | ======filesize====== | ||
+ | |||
< | < | ||
- | Return the size of a file, or the number of unread bytes in a stream | + | Return the size of a file, or the number of unread bytes in a stream |
====Description==== | ====Description==== | ||
+ | |||
There are two different forms for this function. | There are two different forms for this function. | ||
**Filename Form** - The syntax is the same as in mainline PHP, and uses a filename for the parameter: | **Filename Form** - The syntax is the same as in mainline PHP, and uses a filename for the parameter: | ||
- | <well size=" | + | <well size=" |
- | <span style=" | + | <span style=" |
- | < | + | <span style=" |
- | <span style=" | + | <span style=" |
- | <span style=" | + | <span style=" |
- | <span style=" | + | <span style=" |
</ | </ | ||
- | **Handle Form** - The syntax is unique to uPHP,((The Handle Form is more commonly used on the Wattmon. Compared to mainline PHP, this uPHP form is a much simpler method for retrieving the number of bytes pending in a stream. For examples of how much more complex mainline PHP can be, take a look at the PHP function [[http:// | + | **Handle Form** - The syntax is unique to uPHP,((The Handle Form is more commonly used on the [[hardware: |
- | <well size=" | + | <well size=" |
- | <span style=" | + | <span style=" |
- | < | + | <span style=" |
- | <span style=" | + | <span style=" |
- | <span style=" | + | <span style=" |
- | <span style=" | + | <span style=" |
</ | </ | ||
Line 30: | Line 32: | ||
====Parameters==== | ====Parameters==== | ||
- | < | ||
- | < | + | <html><b>< |
- | ====Return | + | < |
- | Bytes in the file or pending in the stream | + | |
+ | ====Return | ||
+ | |||
+ | < | ||
====Examples==== | ====Examples==== | ||
- | **Example #1** - Filename Form, output the size of the System Log: | + | ===Filename Form, output the size of the System Log=== |
<code php> | <code php> | ||
<? | <? | ||
- | $syslog="/ | + | |
- | if (file_exists($syslog)) print(" | + | if (file_exists($syslog)) print(" |
?> | ?> | ||
</ | </ | ||
- | **Example #2** - Handle Form, for a file, output the file size: | + | ===Handle Form, for a file, output the file size=== |
<code php> | <code php> | ||
- | <? | + | <? |
- | $f=fopen("/ | + | $f=fopen("/ |
- | if ($f) { | + | if ($f) { |
- | print(filesize($f)); | + | print(filesize($f)); |
- | fclose($f); | + | fclose($f); |
- | } | + | } |
?></ | ?></ | ||
- | **Example #3** - Handle Form, for a socket | + | ===Handle Form, for a socket=== |
+ | |||
+ | This example is extracted from the Wattmon OS "/ | ||
<code php> | <code php> | ||
<? | <? | ||
- | $dns_ip=ini_get("/ | + | |
- | $f=fsockopen($dns_ip, | + | $f=fsockopen($dns_ip, |
- | if ($f) { | + | if ($f) { |
- | //... code not shown: send a request to my.wattmon.com using fwrite() ... | + | // ... code not shown: send a request to my.wattmon.com using fwrite() ... |
- | while (!filesize($f)) sleep(10); //wait until we begin to get a response | + | while (!filesize($f)) sleep(10); // wait until we begin to get a response |
- | $str=fread($f, | + | $str=fread($f, |
- | //... code not shown: process the response in $str ... | + | // ... code not shown: process the response in $str ... |
- | } | + | } |
?> | ?> | ||
</ | </ | ||
Line 76: | Line 82: | ||
====See Also==== | ====See Also==== | ||
- | [[feof()]] - Test if no more data is available in a file or stream [possibly useful if you don't need to know the exact number of bytes pending in a stream] | ||
[[findfirst()]] - Start searching the current folder for files matching a pattern and attributes [' | [[findfirst()]] - Start searching the current folder for files matching a pattern and attributes [' | ||
Line 82: | Line 87: | ||
[[fopen()]] - Open a file for reading or writing | [[fopen()]] - Open a file for reading or writing | ||
- | [[f485open()]] - Open the RS-485 | + | [[fseropen()]] - Open the serial |
- | [[fseropen()]] - Open the serial | + | [[f485open()]] - Open the RS-485 |
- | [[fsockopen()]] - Open an internet socket connection | + | [[fsockopen()]] - Open an internet socket connection |
- | [[fclose()]] - Close a file, stream or socket | + | [[fread()]] - Read bytes from a file, stream or socket |
- | [[file_exists()]] - Check if a file exists | + | [[fgets()]] - Return a single line from a file, stream or socket, with optional size limit |
- | [[ini_get()]] - Return the value associated with the key if it exists, or the default value otherwise | + | [[fwrite()]] - Write data to a file, stream |
- | [[fread()]] - Return bytes from a file or stream | + | [[feof()]] - Test if no more data is available in a file, stream |
+ | |||
+ | [[fseek()]] - Position the file pointer in an open file | ||
+ | |||
+ | [[ftell()]] - Return the current position of a file read/write pointer | ||
+ | |||
+ | [[fclose()]] - Close a file, stream or socket | ||
+ | |||
+ | [[file_exists()]] - Check if a file exists | ||
- | [[uphp: | + | [[ini_get()]] - Get a value from an INI file |
- | [[uphp: | ||