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| Code | ||||||||||
<?php class filter { var $functions; var $separator; function filter () { $this->functions = func_get_args (); is_array ($this->functions) or die ('<b>Filter Class Error Message:</b><br> <br> You must provide at least one argument for the filter class constructor.<br><br> <font color="#ffcc00">For example:</font> $my_filter = new filter ("trim")<br> For more complete examples, please see the documentation included with this class.<br>'); foreach ($this->functions as $function) { function_exists ($function) or die ("<b>Filter Class Error Message:</b> <br><br> The function named <b>$function</b> is not defined."); @ $function (''); ! isset ($php_errormsg) or die ("<b>Filter Class Error Message:</b> <br><br> There was a problem with the function named <b>$function</b>, that you passed to the constructor.<br>When I tested the function to check if it would accept one argument, it returned this error:<br> $php_errormsg"); } reset ($this->functions); $this->set_separator (); } function apply ($data) { if ( ! is_array ($data)) { foreach ($this->functions as $function) $data = $function ($data); } return $data; foreach ($data as $key => $value) foreach ($this->functions as $function) $data[$key] = $function ($value); return $data; } function output ($data) { $data = $this->apply ($data); print is_array ($data) ? implode ($this->separator, $data) : $data; return true; } function set_separator ($separator = ' ') { $this->separator = $separator; return true; } } /* DESCRIPTION ============================================================ Filter: A simple class that lets you create custom filters from multiple functions and apply these filters to scalar variables or arrays. ============================================================ CREDITS ============================================================ Author: J. A. Greant ( zak@nucleus.com ) Version 1: May 27, 2000 ============================================================ NOTICES ============================================================ If you: Modify this code and want to share your changes :) Find a bug Have other questions or comments Please write: Zak Greant (zak@nucleus.com) ============================================================ USAGE EXAMPLES ============================================================ // Make sure to include the filter class in your source code include ('/path/to/filter.inc'); // Create a new filter $my_filter = new filter ('trim', 'strrev', 'ucwords'); // Set up some sample data $original = " Hello Jimmy \n"; // Apply the filter to your sample data $modified = $my_filter->apply ($original); // Output the filtered data $my_filter->output ($original); ============================================================ USAGE NOTES ============================================================ The filter class has a default constructor and three methods. The filter Constructor ---------------------- The constructor accepts one or more arguments. Each argument should be a string that is the name of a valid function. The functions that you pass to the constructor should accept a single scalar as an argument. it is best to use functions like trim or addslashes that perform simple modifications on string data and return the modified data. The constructor checks the function names passed to it to ensure that the function exists and can accept a single scalar variable as an argument. If either of these tests fails, the script trying to instantiate the class will exit. An error message indicating the nature of the problem will be displayed. If no errors are generated, then the function names will be stored by class for later use by the apply and output methods. Example: $my_filter = new filter ('trim', 'htmlentities'); The apply Method ---------------- Apply accepts a single scalar or array as an argument. The method operates by applying each function stored by the class to the argument that was passed to it. The functions will be applied to the argument in the order that they were passed to the constructor. Example: $my_filter = new filter ('trim', 'reverse', 'ucwords'); $original = " Hello Jimmy \n"; $modified = $my_filter->apply ($original); $modified will now contain: Ymmij Olleh The output Method ----------------- The output method works very much like apply. The major differences are that output prints the modified value instead of returning it - and - if an array is passed to this method, then it is joined into a string before being printed. Each element in the array will be separated by a single space. Examples: $my_filter = new filter ('trim', 'reverse', 'ucwords'); $original = " Hello Jimmy \n"; $my_filter->output ($original); // The above line will print: Ymmij Olleh $array = array ('Hello','Jimmy'); $my_filter->output ($array); // The above line will print: Ymmij Olleh The set_separator Method ------------------------ This method allows you to set the character (or characters) that separate array elements when an array is printed out with the output method. The default character is a single space. Example: $array = array ('Hello','Jimmy'); $my_filter->output ($array); // The above line will print: Ymmij Olleh $my_filter->set_separator ('&'); $my_filter->output ($array); // The above line will print: Ymmij&Olleh ============================================================ !!WARNINGS!! ============================================================ The functions that you use to create your new filter MUST: Accept only **one** argument. The functions that you use to create your new filter SHOULD: Accept a string as their argument. Return a string. error_tracking should be set to On in your php.ini file ============================================================ COPYRIGHT ============================================================ Copyright (c) 2000 J. A. Greant ( zak@nucleus.com ) All rights reserved. This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the: Free Software Foundation, Inc. 59 Temple Place, Suite 330 Boston, MA 02111-1307 USA http://www.gnu.com/ ============================================================ */ ?> | ||||||||||
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