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| Code | |||||
<?php /* +----------------------------------------------------------------------+ | Copyright (c) 2000 J.A.Greant | | (See end of file for usage notes and licensing information.) | +----------------------------------------------------------------------+ */ class str { function pop (&$string) { if ( 0 == strlen ($string) || is_array ($string)) return FALSE; $pop = substr ($string, -1); $string = substr ($string, 0, -1); return $pop; } function push (&$var) { if (is_array ($var) || is_object ($var) || is_resource ($var)) return FALSE; $args = func_get_args (); $var = implode ('', $args); return strlen ($var); } function shift (&$string) { if ( 0 == strlen ($string) || is_array ($string)) return FALSE; $unshift = substr ($string, 0, 1); $string = substr ($string, 1); return $unshift; } function unshift (&$var) { if (is_array ($var) || is_object ($var) || is_resource ($var)) return FALSE; $args = array_reverse (func_get_args ()); $var = implode ('', $args); return strlen ($var); } } /* +----------------------------------------------------------------------+ | FILE NAME: str.php | +----------------------------------------------------------------------+ | Author: J.A.Greant | | Email : zak@nucleus.com | | Date : 2000/11/23 | +----------------------------------------------------------------------+ | The str class provides 4 perl-like methods for manipulating strings | | and other scalar variables. | | | |--> WARNING: The following methods operate directly on the values <--| |--> passed to them. pop and shift shorten the value passed, while <--| |--> push and unshift make the first variable passed to the method <--| |--> contain all of the values passed to the method. <--| | | | str::pop() method | | ----------------- | | Strip the rightmost character from a scalar variable and return the | | character. | | NOTE: pop() must be used on a variable and not a literal value. | | | | USAGE EXAMPLE: | | $string = "Humpty Dumpty sat on a wall."; | | $chr = str::pop ($string); | | print $chr; // Contains "." | | print $string; // Contains "Humpty Dumpty sat on a wall" | | | | str::push() method | | ------------------ | | Join one or more scalar values onto the right end of a scalar | | variable. The values are concatenated from left to right, in the | | order that they were specified. | | NOTE: The first argument for push() must be a variable and not a | | literal value. All other arguments may be literal values. | | | | USAGE EXAMPLE: | | $string = "Humpty Dumpty sat on a wall.\n"; | | $string_2 = "Humpty Dumpty had a great fall.\n"; | | $length = str::push ($string, $string_2); | | print $length; // Contains 61 | | print $string; // Contains $string . $string_2 | | | | str::shift() method | | ------------------- | | Strip the leftmost character from a scalar variable and return the | | character. | | NOTE: shift() must be used on a variable and not a literal value. | | | | USAGE EXAMPLE: | | $string = "Humpty Dumpty sat on a wall."; | | $chr = str::shift ($string); | | print $chr; // Contains "H" | | print $string; // Contains "umpty Dumpty sat on a wall." | | | | str::unshift() method | | ------------------ | | Join one or more scalar values onto the left end of a scalar | | variable. The values are concatenated from right to left, in the | | order that they were specified. | | NOTE: The first argument for unshift() must be a variable and not a | | literal value. All other arguments may be literal values. | | | | USAGE EXAMPLE: | | $string = 'fe'; | | $length = str::unshift ($string, 'fi', 'fo', 'foo'); | | print $length; // Contains 9 | | print $string; // Contains "foofofife" | +----------------------------------------------------------------------+ +----------------------------------------------------------------------+ | CVS LOG INFO | +----------------------------------------------------------------------+ $Log: str.pkg,v $ Revision 1.3 2001/01/02 03:56:14 zak Added tests to handle empty strings for pop and shift. $Log: str.pkg,v $ Revision 1.2 2000/11/24 02:08:04 zak Simplified code for push and unshift. Removed extraneous comments. Revision 1.1.1.1 2000/11/24 01:49:50 zak Initial import of php code repository +----------------------------------------------------------------------+ | Copyright (c) 2000 J.A.Greant (zak@nucleus.com) | | All rights reserved. | +----------------------------------------------------------------------+ | Redistribution and use in source and binary forms, with or without | | modification, is permitted provided that the following conditions | | are met: | +----------------------------------------------------------------------+ | Redistributions of source code must retain the above copyright | | notice, this list of conditions and the following disclaimer. | | | | Redistributions in binary form must reproduce the above copyright | | notice, this list of conditions and the following disclaimer in the | | documentation and/or other materials provided with the distribution. | | | | Neither the name of the author nor the names of any contributors to | | this software may be used to endorse or promote products derived | | from this software without specific prior written permission. | | | | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | | ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | | FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | | AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, | | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | | CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN | | ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | | POSSIBILITY OF SUCH DAMAGE. | +----------------------------------------------------------------------+ */ ?> | |||||
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