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String Functions
A collection of string related functions. These functions work on strings, arrays of strings and any depth of arrays of strings.
class.strings.php
<?php
//
// class.strings.php
// version 1.4.2, 2004-08-16
//
// Description
//
// A PHP library of helpful string manipulation methods. This class does not
// need to be assigned to an object, as you could use the :: access method,
// such as Strings::validateString
//
// Author
//
// Andrew Collington, 2004
// php@amnuts.com, http://php.amnuts.com/
//
// Feedback
//
// There is message board at the following address:
//
// http://php.amnuts.com/forums/index.php
//
// Please use that to post up any comments, questions, bug reports, etc. You
// can also use the board to show off your use of the script.
//
// License
//
// This class is available free of charge for personal or non-profit work. If
// you are using it in a commercial setting, please contact php@amnuts.com for
// payment and licensing terms.
//
// Support
//
// If you like this script, or any of my others, then please take a moment
// to consider giving a donation. This will encourage me to make updates and
// create new scripts which I would make available to you. If you would like
// to donate anything, then there is a link from my website to PayPal.
//
class Strings
{
/**
* Validates whether the given element is a string.
*
* @return bool
* @param string $element
* @param bool $require_content If the string can be empty or not
*/
function validateString($element, $require_content = true)
{
return (!is_string($element)) ? false : ($require_content && $element == '' ? false : true);
}
/**
* Validates whether the given element is an array.
*
* @return bool
* @param array $element
* @param bool $require_content If the array can be empty or not
*/
function validateArray($element, $require_content = true)
{
return (!is_array($element)) ? false : ($require_content && empty($element) ? false : true);
}
/**
* Validates whether an email address has a valid format.
*
* @return bool
* @param string $email
*/
function validateEmail($email)
{
return (eregi("[0-9a-z]([-_.]?[0-9a-z])*@[0-9a-z]([-.]?[0-9a-z])*\\.[a-z]{2,3}", $email)) ? true : false;
}
/**
* Converts high-character symbols into their respective html entities.
*
* @return string
* @param string $string
*/
function convertSymbolsToEntities($string)
{
static $symbols =
array(
'‚', 'ƒ', '„', '…', '†', '‡', 'ˆ', '‰', 'Š', '‹', 'Œ', '‘', '’', '“', '”',
'•', '–', '—', '˜', '™', 'š', '›', 'œ', 'Ÿ', '€', 'Æ', 'Á', 'Â', 'À', 'Å',
'Ã', 'Ä', 'Ç', 'Ð', 'É', 'Ê', 'È', 'Ë', 'Í', 'Î', 'Ì', 'Ï', 'Ñ', 'Ó', 'Ô',
'Ò', 'Ø', 'Õ', 'Ö', 'Þ', 'Ú', 'Û', 'Ù', 'Ü', 'Ý', 'á', 'â', 'æ', 'à', 'å',
'ã', 'ä', 'ç', 'é', 'ê', 'è', 'ð', 'ë', 'í', 'î', 'ì', 'ï', 'ñ', 'ó', 'ô',
'ò', 'ø', 'õ', 'ö', 'ß', 'þ', 'ú', 'û', 'ù', 'ü', 'ý', 'ÿ', '¡', '£', '¤',
'¥', '¦', '§', '¨', '©', 'ª', '«', '¬', '', '®', '¯', '°', '±', '²', '³',
'´', 'µ', '¶', '·', '¸', '¹', 'º', '»', '¼', '½', '¾', '¿', '×', '÷', '¢',
'…', 'µ');
static $entities =
array(
'‚', 'ƒ', '„', '…', '†', '‡', 'ˆ',
'‰', 'Š', '‹', 'Œ', '‘', '’', '“',
'”', '•', '–', '—', '˜', '™', 'š',
'›', 'œ', 'Ÿ', '€', 'æ', 'á', 'â',
'à', 'å', 'ã', 'ä', 'ç', 'ð', 'é',
'ê', 'è', 'ë', 'í', 'î', 'ì', 'ï',
'ñ', 'ó', 'ô', 'ò', 'ø', 'õ', 'ö',
'þ', 'ú', 'û', 'ù', 'ü', 'ý', 'á',
'â', 'æ', 'à', 'å', 'ã', 'ä', 'ç',
'é', 'ê', 'è', 'ð', 'ë', 'í', 'î',
'ì', 'ï', 'ñ', 'ó', 'ô', 'ò', 'ø',
'õ', 'ö', 'ß', 'þ', 'ú', 'û', 'ù',
'ü', 'ý', 'ÿ', '¡', '£', '¤', '¥',
'¦', '§', '¨', '©', 'ª', '«', '¬',
'­', '®', '¯', '°', '±', '²', '³',
'´', 'µ', '¶', '·', '¸', '¹', 'º',
'»', '¼', '½', '¾', '¿', '×', '÷',
'¢', '...', 'µ');
if (Strings::validateString($string, false)) {
return str_replace($symbols, $entities, $string);
} else {
return $string;
}
}
/**
* Converts all strings, or all elements of an array, no matter how nested
* the array is, to html entities.
*
* @return string|array
* @param string|array $element
*/
function convertTextToHTML($element)
{
return Strings::processFunction($element, 'htmlentities');
}
/**
* Cuts the given string to a certain length without breaking a word.
*
* @return string
* @param string $string
* @param int $length number of maximum characters leave remaining
* @param bool $more whether to display '...' on the end of the trimmed string
*/
function trimStringToLength($string, $length, $more = true)
{
if (Strings::validateString($string)) {
$trimmed = str_replace('<br>', '... ', ereg_replace('(<br>)+', '<br>', $string));
$trimmed = strip_tags($trimmed);
if (strlen($trimmed) > $length) {
$trimmed = substr($trimmed, 0, strrpos(substr($trimmed, 0, $length), ' '));
if ($more === true) {
$trimmed .= '...';
}
}
return $trimmed;
}
}
/**
* Removes the first or last word from a string.
*
* @return string
* @param string $string
* @param bool $start whether to trim at start (true) or end (false) of string
*/
function trimWordFromString($string, $start = true)
{
if (Strings::validateString($string)) {
$trimmed = trim($string);
if (!substr_count($trimmed, ' ')) {
return $trimmed;
} else {
return ($start) ? substr($trimmed, strpos($trimmed, ' ')+1, strlen($trimmed)) : substr($trimmed, 0, strrpos($trimmed, ' '));
}
}
}
/**
* Removes the first word from a string.
*
* @return string
* @param string $string
* @see trimWordFromString()
*/
function trimFirstWordFromString($string)
{
return Strings::trimWordFromString($string, true);
}
/**
* Removes the last word from a string.
*
* @return string
* @param string $string
* @see trimWordFromString()
*/
function trimLastWordFromString($string)
{
return Strings::trimWordFromString($string, false);
}
/**
* Can perform a full trim a string, or all elements of an array, no
* matter how nested the array is.
*
* @return string|array
* @param string|array $element
*/
function trimString($element)
{
return Strings::processFunction($element, 'trim');
}
/**
* Can left-trim a string, or all elements of an array, no matter
* how nested the array is.
*
* @return string|array
* @param string|array $element
*/
function trimStringLeft($element)
{
return Strings::processFunction($element, 'ltrim');
}
/**
* Can right-trim a string, or all elements of an array, no matter
* how nested the array is.
*
* @return string|array
* @param string|array $element
*/
function trimStringRight($element)
{
return Strings::processFunction($element, 'rtrim');
}
/**
* Adds slashes to a string, or all elements of an array, no matter
* how nested the array is.
*
* If the 'check_gpc' parameter is true then slashes will be applied
* depending on magic_quotes setting.
*
* @return string|array
* @param string|array $element
* @param bool $check_gpc
*/
function addSlashesToString($element, $check_gpc = true)
{
return ($check_gpc && get_magic_quotes_gpc()) ? $element : Strings::processFunction($element, 'addslashes');
}
/**
* Removes slashes from a string, or all elements of an array, no matter
* how nested the array is.
*
* If the 'check_gpc' parameter is true then slashes will be removed
* depending on magic_quotes setting.
*
* @return string|array
* @param string|array $element
* @param bool $check_gpc
*/
function trimSlashesFromString($element, $check_gpc = true)
{
return ($check_gpc && !get_magic_quotes_gpc()) ? $element : Strings::processFunction($element, 'stripslashes');
}
/**
* Performs the passed function recursively.
*
* @return string|array
* @param string|array $element
* @param string $function
*/
function processFunction($element, $function)
{
if (function_exists($function) === true) {
if (Strings::validateArray($element, false) === false) {
return $function($element);
} else {
foreach ($element as $key => $val) {
if (Strings::validateArray($element[$key], false)) {
$element[$key] = Strings::processFunction($element[$key], $function);
} else {
$element[$key] = $function($element[$key]);
}
}
}
}
return $element;
}
/**
* Get the ordinal value of a number (1st, 2nd, 3rd, 4th).
*
* @return string
* @param int $value
*/
function getOrdinalString($value)
{
static $ords = array('th', 'st', 'nd', 'rd');
if ((($value %= 100) > 9 && $value < 20) || ($value %= 10) > 3) {
$value = 0;
}
return $ords[$value];
}
/**
* Returns the plural appendage, handy for instances like: 1 file,
* 5 files, 1 box, 3 boxes.
*
* @return string
* @param int $value
* @param string $append what value to append to the string
*/
function getPluralString($value, $append = 's')
{
return ($value == 1 ? '' : $append);
}
/**
* Strips all newline characters (\n) from a string or recursively
* through a multi-dimensional array.
*
* @return string|array
* @param string|array $element
*/
function trimNewlinesFromString($element)
{
if (Strings::validateArray($element, false) === false) {
return str_replace("\n", '', $element);
} else {
foreach ($element as $key => $val) {
if (Strings::validateArray($element[$key], false)) {
$element[$key] = Strings::trimNewlinesFromString($element[$key]);
} else {
$element[$key] = str_replace("\n", '', $element[$key]);
}
}
}
return $element;
}
/**
* Strips all carriage return characters (\r) from a string or
* recursively through a multi-dimensional array.
*
* @return string|array
* @param string|array $element
*/
function trimCarriageReturnsFromString($element)
{
if (Strings::validateArray($element, false) === false) {
return str_replace("\r", '', $element);
} else {
foreach ($element as $key => $val) {
if (Strings::validateArray($element[$key], false)) {
$element[$key] = Strings::trimCarriageReturnsFromString($element[$key]);
} else {
$element[$key] = str_replace("\r", '', $element[$key]);
}
}
}
return $element;
}
/**
* Returns the extension of a file (ie. anything that appears after
* the last '.')
*
* @return string|null
* @param string $string
*/
function getFileExtension($string)
{
if (Strings::validateString($string)) {
return substr($string, (strrpos($string, '.') ? strrpos($string, '.')+1 : strlen($string)), strlen($string));
} else {
return null;
}
}
/**
* Returns the name of a file (ie. anything that appears before
* the last '.')
*
* @return string|null
* @param string $string
*/
function getFileName($string)
{
if (Strings::validateString($string)) {
return substr($string, 0, (strrpos($string, '.') ? strrpos($string, '.') : strlen($string)));
} else {
return null;
}
}
/**
* Displays a human readable file size.
*
* @return string|null
* @param string $file
* @param bool $round
*/
function getFileSize($file, $round = false)
{
if (@file_exists($file)) {
$value = 0;
$size = filesize($file);
if ($size >= 1073741824) {
$value = round($size/1073741824*100)/100;
return ($round) ? round($value) . 'Gb' : "{$value}Gb";
} else if ($size >= 1048576) {
$value = round($size/1048576*100)/100;
return ($round) ? round($value) . 'Mb' : "{$value}Mb";
} else if ($size >= 1024) {
$value = round($size/1024*100)/100;
return ($round) ? round($value) . 'kb' : "{$value}kb";
} else {
return "$size bytes";
}
} else {
return null;
}
}
/**
* Counts number of words in a string.
*
* if $real_words == true then remove things like '-', '+', that
* are surrounded with white space.
*
* @return string|null
* @param string $string
* @param bool $real_words
*/
function countWords($string, $real_words = true)
{
if (Strings::validateString($string)) {
if ($real_words == true) {
$string = preg_replace('/(\s+)[^a-zA-Z0-9](\s+)/', ' ', $string);
}
return (count(split('[[:space:]]+', $string)));
} else {
return null;
}
}
/**
* Counts number of sentences in a string.
*
* @return string|null
* @param string $string
*/
function countSentences($string)
{
if (Strings::validateString($string)) {
return preg_match_all('/[^\s]\.(?!\w)/', $string, $matches);
} else {
return null;
}
}
/**
* Counts number of sentences in a string.
*
* @return string|null
* @param string $string
*/
function countParagraphs($string)
{
if (Strings::validateString($string)) {
$string = str_replace("\r", "\n", $string);
return count(preg_split('/[\n]+/', $string));
} else {
return false;
}
}
/**
* Gather information about a passed string.
*
* If $real_words == true then remove things like '-', '+', that are
* surrounded with white space.
*
* @return string|null
* @param string $string
* @param bool $real_words
*/
function getStringInformation($string, $real_words = true)
{
if (Strings::validateString($string)) {
$info = array();
$info['character'] = ($real_words) ? preg_match_all('/[^\s]/', $string, $matches) : strlen($string);
$info['word'] = Strings::countWords($string, $real_words);
$info['sentence'] = Strings::countSentences($string);
$info['paragraph'] = Strings::countParagraphs($string);
return $info;
} else {
return null;
}
}
}
?>
16.07kb in size
last modified May 6, 2006 at 1:55pm
8374 views, 5774 downloads
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