highlight_file(3) [php man page]

HIGHLIGHT_FILE(3)							 1							 HIGHLIGHT_FILE(3)

highlight_file - Syntax highlighting of a file

SYNOPSIS

       mixed highlight_file (string  $filename, [bool  $return = false])

DESCRIPTION

	Prints	out  or  returns  a  syntax highlighted version of the code contained in $filename using the colors defined in the built-in syntax
       highlighter for PHP.

	Many servers are configured to automatically highlight files with a phps extension. For example, example.phps when viewed  will  show  the
       syntax highlighted source of the file. To enable this, add this line to the httpd.conf:

       AddType application/x-httpd-php-source .phps

PARAMETERS

	      o $filename
		- Path to the PHP file to be highlighted.

	      o $return
		- Set this parameter to TRUE to make this function return the highlighted code.

RETURN VALUES

	If $return is set to TRUE, returns the highlighted code as a string instead of printing it out. Otherwise, it will return TRUE on success,
       FALSE on failure.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 4.2.1	|						    |
       |	|						    |
       |	|  This function is now also affected by  safe_mode |
       |	| and open_basedir.				    |
       |	|						    |
       +--------+---------------------------------------------------+
NOTES

       Caution

	       Care should be taken when using the highlight_file(3) function to make sure that you do not inadvertently reveal sensitive informa-
	      tion such as passwords or any other type of information that might create a potential security risk.

       Note

	      When the $return parameter is used, this function uses internal output buffering so it cannot be used inside an ob_start(3) callback
	      function.

SEE ALSO

       highlight_string(3), Highlighting INI directives.

PHP Documentation Group 													 HIGHLIGHT_FILE(3)

ISSET(3)								 1								  ISSET(3)

isset - Determine if a variable is set and is not NULL

SYNOPSIS

       bool isset (mixed  $var, [mixed	$...])

DESCRIPTION

	Determine if a variable is set and is not NULL.

	If  a  variable has been unset with unset(3), it will no longer be set. isset(3) will return FALSE if testing a variable that has been set
       to NULL. Also note that a null character ( "") is not equivalent to the PHP NULL constant.

	If multiple parameters are supplied then isset(3) will return TRUE only if all of the parameters are set. Evaluation  goes  from  left	to
       right and stops as soon as an unset variable is encountered.

PARAMETERS

	      o $var
		- The variable to be checked.

	      o $...
		- Another variable ...

RETURN VALUES

	Returns TRUE if $var exists and has value other than NULL, FALSE otherwise.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.4.0	|						    |
       |	|						    |
       |	|  Checking  non-numeric  offsets  of  strings	now |
       |	| returns FALSE.				    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES

       Example #1

	      isset(3) Examples

	      <?php

	      $var = '';

	      // This will evaluate to TRUE so the text will be printed.
	      if (isset($var)) {
		  echo "This var is set so I will print.";
	      }

	      // In the next examples we'll use var_dump to output
	      // the return value of isset().

	      $a = "test";
	      $b = "anothertest";

	      var_dump(isset($a));	// TRUE
	      var_dump(isset($a, $b)); // TRUE

	      unset ($a);

	      var_dump(isset($a));     // FALSE
	      var_dump(isset($a, $b)); // FALSE

	      $foo = NULL;
	      var_dump(isset($foo));   // FALSE

	      ?>

	This also work for elements in arrays:

       <?php

       $a = array ('test' => 1, 'hello' => NULL, 'pie' => array('a' => 'apple'));

       var_dump(isset($a['test']));	       // TRUE
       var_dump(isset($a['foo']));	       // FALSE
       var_dump(isset($a['hello']));	       // FALSE

       // The key 'hello' equals NULL so is considered unset
       // If you want to check for NULL key values then try:
       var_dump(array_key_exists('hello', $a)); // TRUE

       // Checking deeper array values
       var_dump(isset($a['pie']['a']));        // TRUE
       var_dump(isset($a['pie']['b']));        // FALSE
       var_dump(isset($a['cake']['a']['b']));  // FALSE

       ?>

       Example #2

	      isset(3) on String Offsets

	       PHP 5.4 changes how isset(3) behaves when passed string offsets.

	      <?php
	      $expected_array_got_string = 'somestring';
	      var_dump(isset($expected_array_got_string['some_key']));
	      var_dump(isset($expected_array_got_string[0]));
	      var_dump(isset($expected_array_got_string['0']));
	      var_dump(isset($expected_array_got_string[0.5]));
	      var_dump(isset($expected_array_got_string['0.5']));
	      var_dump(isset($expected_array_got_string['0 Mostel']));
	      ?>

	      Output of the above example in PHP 5.3:

	      bool(true)
	      bool(true)
	      bool(true)
	      bool(true)
	      bool(true)
	      bool(true)

	      Output of the above example in PHP 5.4:

	      bool(false)
	      bool(true)
	      bool(true)
	      bool(true)
	      bool(false)
	      bool(false)

NOTES

       Warning

	      isset(3) only works with variables as passing anything else will result in a parse error. For checking if constants are set use  the
	      defined(3) function.

       Note

	      Because this is a language construct and not a function, it cannot be called using variable functions.

       Note

	       When using isset(3) on inaccessible object properties, the __isset() overloading method will be called, if declared.

SEE ALSO

       empty(3), __isset(), unset(3), defined(3), the type comparison tables, array_key_exists(3), is_null(3), the error control @ operator.

PHP Documentation Group 														  ISSET(3)