PHP, Filesystems and File I/O - Revision history

Neil: Text replacement - " " to "
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2016-10-27T20:14:50Z
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<td width="20%">[[Working with Strings and Text in PHP|Previous]]<td align="center">[[PHP Essentials|Table of Contents]]<td width="20%" align="right">[[Working with Directories in PHP|Next]]</td>

<td width="20%">[[Working with Strings and Text in PHP|Previous]]<td align="center">[[PHP Essentials|Table of Contents]]<td width="20%" align="right">[[Working with Directories in PHP|Next]]</td>

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Neil: Text replacement - "" to "
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2016-05-05T14:44:24Z
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<td width="20%">[[Working with Strings and Text in PHP|Previous]]<td align="center">[[PHP Essentials|Table of Contents]]<td width="20%" align="right">[[Working with Directories in PHP|Next]]</td>

<td width="20%">[[Working with Strings and Text in PHP|Previous]]<td align="center">[[PHP Essentials|Table of Contents]]<td width="20%" align="right">[[Working with Directories in PHP|Next]]</td>

Neil: Text replacement - "php" to "php"

2016-02-01T22:22:12Z

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Neil: Text replacement - "BUY_PHP_BOTTOM" to "php"

2016-02-01T22:21:38Z

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Neil: Text replacement - "BUY_PHP" to "php"

2016-02-01T22:21:37Z

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Neil: Text replacement - "ADSDAQBOX_FLOW" to "adsdaqbox_flow"

2016-02-01T18:03:39Z

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Neil at 16:54, 13 May 2009

2009-05-13T16:54:22Z

Neil: /* Reading From a File using PHP */

2009-05-11T19:58:09Z

‎Reading From a File using PHP

← Older revision		Revision as of 22:21, 1 February 2016
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 Existing files are opened, and new files created using the PHP ''fopen()'' function. The ''fopen()'' function accepts two arguments and returns a ''file handle'' which is subsequently used for all future read and write interactions with that file. The first argument is the name (including the path) of the file to open. This path is relative to the server filesystem root, not your web server root. The second argument is an attribute indicating the mode in which to open the file (create, read only, write only etc). The following table lists the various file open attributes together with a brief description of each:
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 == Opening and Creating Files in PHP ==
-Existing files are opened, and new files created using the PHP ''fopen()'' function. The ''fopen()'' function accepts two arguments and returns a ''file handle'' which is subsequently used for all future read and write interactions with that file. The first argument is the name (including the path) of the file to open. This path is relative to the server filesystem root, not your web server root. The second argument is an attribute indicating the mode in which you with to open the file (create, read only, write only etc). The following table lists the various file open attributes together with a brief description of each:
+Existing files are opened, and new files created using the PHP ''fopen()'' function. The ''fopen()'' function accepts two arguments and returns a ''file handle'' which is subsequently used for all future read and write interactions with that file. The first argument is the name (including the path) of the file to open. This path is relative to the server filesystem root, not your web server root. The second argument is an attribute indicating the mode in which to open the file (create, read only, write only etc). The following table lists the various file open attributes together with a brief description of each:
 <google>ADSDAQBOX_FLOW</google>
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 Once a file has been opened it can be closed using the ''fclose()'' function. The ''fclose()'' function takes a single argument - the ''file handle'' returned by the ''fopen'' function when the file was first opened.
-Given this information we can write a script to open a file. For the purposes of this example we will create a new file in the /tmp direcotry of our web server. We will open the file in ''w+'' mode so that it will be created if it does not already exist and provide both read and write access. We will then close the file using ''fclose()'':
+Given this information we can write a script to open a file. For the purposes of this example we will create a new file in the /tmp directory of our web server. We will open the file in ''w+'' mode so that it will be created if it does not already exist and provide both read and write access. We will then close the file using ''fclose()'':
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 Having created and opened the file the next task is to write data to the file. We can do this using the PHP ''fwrite()'' and ''fputs()'' functions. These are essentially the same function so either can be used.
-''fwrite()'' takes two arguments, the ''file handle'' returned form the original ''fopen()'' callm and the string to be written. We can, therefore, extend our example to write a string to our file:
+''fwrite()'' takes two arguments, the ''file handle'' returned from the original ''fopen()'' call and the string to be written. We can, therefore, extend our example to write a string to our file:
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 == Checking Whether a File Exists ==
-The ''file_exists'' fuinction can be used at any time to find if a file already exists in the filesystem. The function takes a single argument - the path to the file in question and returns a boolean ''true'' or ''false'' value depending on the existance of the file.
+The ''file_exists'' function can be used at any time to find if a file already exists in the filesystem. The function takes a single argument - the path to the file in question and returns a boolean ''true'' or ''false'' value depending on the existence of the file.
 == Moving, Copying and Deleting Files with PHP ==
-Files can be copied using the ''copy()'' function, renamed using the ''rename()'' function and deleted using the ''unlink()'' function. For example we can perform a number tasks on our example file:
+Files can be copied using the ''copy()'' function, renamed using the ''rename()'' function and deleted using the ''unlink()'' function. For example we can perform a number of tasks on our example file:
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 Output buffering in PHP is a mechanism whereby content that would normally be sent directly to the output stream is initially held in a buffer until the buffer is flushed. This provides control over when output is presented to the user (perhaps in situations where there is a delay in gathering some data from a database for example).
-Output Buffering is initaited using the ''ob_start()'' function. ''ob_start()'' can be called with no arguments but does support three optional arguments:
+Output Buffering is initiated using the ''ob_start()'' function. ''ob_start()'' can be called with no arguments but does support three optional arguments:
 * callback function - specifies a user defined function to be called before the buffer is flushed
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 ?>
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← Older revision		Revision as of 19:58, 11 May 2009
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	<tt>data = This line of text was written by PHP</tt><br>		<tt>data = This line of text was written by PHP</tt><br>
		+
		+	Note the use of the "OR die()" syntax in the above example. The reason for this is to call the ''die()'' function if the specified file cannot be opened. The purpose of the built-in PHP ''die()'' function is to display a message (specified within the parentheses) and then exit the script. This prevents the remaining PHP code from executing and attempting to read from a file which could not be opened.

	It is also possible to read and output the contents of an entire file with the ''readfile()'' function. This function reads the entire contents of a file and outputs that content. Assuming you don't need to do anything but output the contents of a file then ''readfile()'' is an easy solution because it does all the work for you. You do not need to open the file, read the data, close the file and display the data. All you need to do is call ''readfile()'' passing in the file path as an argument and it does the rest.		It is also possible to read and output the contents of an entire file with the ''readfile()'' function. This function reads the entire contents of a file and outputs that content. Assuming you don't need to do anything but output the contents of a file then ''readfile()'' is an easy solution because it does all the work for you. You do not need to open the file, read the data, close the file and display the data. All you need to do is call ''readfile()'' passing in the file path as an argument and it does the rest.

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