CIX. Funkce pro pr�ci s �et�zci

�vod

V�echny tyto funkce r�zn�mi zp�soby pracuj� s �et�zci. N�kter� specializovan�j�� funkce najdete v sekc�ch regul�rn�ch v�raz� a obsluha URL.

Informace o chov�n� �et�zc�, zvl�t� v souvislosti s pou�it�m jednoduch�ch uvozovek, dvojit�ch uvozovek a znak� opat�en�ch zp�tn�mi lom�tky, viz polo�ky �et�zce v sekci Typy tohoto manu�lu.

Po�adavky

Tyto funkce jsou k dispozici jako sou��st standardn�ho modulu, kter� je v�dy dostupn�.

Instalace

K pou��v�n� t�chto funkc� nen� t�eba ��dn� instalace, jsou sou��st� j�dra PHP.

P�eddefinovan� konstanty

Tyto konstanty jsou definov�ny t�mto roz��en�m a budou k dispozici pouze tehdy, bylo-li roz��en� zkompilov�no spole�n� s PHP nebo dynamicky zavedeno za b�hu.

CRYPT_SALT_LENGTH integer
CRYPT_STD_DES integer
CRYPT_EXT_DES integer
CRYPT_MD5 integer
CRYPT_BLOWFISH integer
HTML_SPECIALCHARS (integer)
HTML_ENTITIES (integer)
ENT_COMPAT (integer)
ENT_QUOTES (integer)
ENT_NOQUOTES (integer)
CHAR_MAX (integer)
LC_CTYPE (integer)
LC_NUMERIC (integer)
LC_TIME (integer)
LC_COLLATE (integer)
LC_MONETARY (integer)
LC_ALL (integer)
LC_MESSAGES (integer)
STR_PAD_LEFT (integer)
STR_PAD_RIGHT (integer)
STR_PAD_BOTH (integer)

Viz tak�

Dal�� informace o mnohem mocn�j��m zach�zen� s �et�zci a obslu�n�mi funkcemi nalezenete v sekc�ch POSIX funkce pro regul�rn� v�razy a Perl kompatibiln� funkce pro regul�rn� v�razy.

Obsah
addcslashes -- Opat�it �et�zec lom�tky ve stylu jazyka C
addslashes -- Opat�it �et�zec lom�tky
bin2hex -- P�ev�st bin�rn� data na hexadecim�ln� reprezentaci
chop -- Odstranit netisknuteln� znaky z konce �et�zce
chr -- Vr�tit ur�it� znak
chunk_split -- Rozd�lit �et�zec na men�� sti
convert_cyr_string -- P�ev�st z jedn� znakov� sady Azbuky do jin�
convert_uudecode -- Decode a uuencoded string
convert_uuencode -- Uuencode a string
count_chars -- Vr�tit informace o znac�ch pou�it�ch v �et�zci
crc32 -- Spo��tat kontroln� sou�et crc32 �et�zce
crypt -- Jednosm�rn� za�ifrov�n� �et�zce
echo -- Vytisknout jeden nebo v�ce �et�zc�
explode -- Rozd�luje �et�zec jin�m �et�zcem
fprintf -- Write a formatted string to a stream
get_html_translation_table -- Vrac� p�ekladovou tabulku pou��vanou v htmlspecialchars() a htmlentities()
hebrev -- P�ev�st logick� Hebrejsk� text na vizu�ln� text
hebrevc -- P�ev�st logick� Hebrejsk� text na vizu�ln� text s konverz� konc� ��dk�
html_entity_decode -- Convert all HTML entities to their applicable characters
htmlentities -- P�ev�st v�echny pou�iteln� znaky na HTML entity
htmlspecialchars -- P�ev�st zvl�tn� znaky na HTML entity
implode -- Spojit prvky pole pomoc� �et�zce
join -- Spojit prvky pole pomoc� �et�zce
levenshtein -- Spo��tat XXX Levenshteinovu vzd�lenost mezi dv�ma �et�zci
localeconv -- Get numeric formatting information
ltrim -- Odstranit netisknuteln� znaky ze za��tku �et�zce
md5_file -- Calculates the md5 hash of a given filename
md5 -- Spo��tat MD5 hash �et�zce
metaphone -- Spo��tat metaphone kl�� et�zce
money_format -- Formats a number as a currency string
nl_langinfo -- Query language and locale information
nl2br -- P�ed v�echny konce ��dk� v �et�zci vlo�� HTML konce ��dk�
number_format -- Format a number with grouped thousands
ord -- Vr�tit ASCII hodnotu znaku
parse_str -- Rozparsovat �et�zec do prom�nn�ch
print -- Vytisknout �et�zec
printf -- Vytisknout form�tovan� �et�zec
quoted_printable_decode -- P�ev�st quoted-printable �et�zec na osmibitov� �et�zec
quotemeta -- Opat�it lom�tky metaznaky
rtrim -- Odstranit netisknuteln� znaky z konce �et�zce
setlocale -- Set locale information
sha1_file -- Calculate the sha1 hash of a file
sha1 -- Calculate the sha1 hash of a string
similar_text -- Spo��tat podobnost dvou �et�zc�
soundex -- Spo��tat soundex kl�� et�zce
sprintf -- Vr�tit form�tovan� �et�zec
sscanf -- Rozparsovat vstupn� �et�zec podle form�tu
str_ireplace -- Case-insensitive version of str_replace().
str_pad -- Doplnit �et�zec jin�m �et�zcem na ur�itou d�lku
str_repeat -- Opakovat �et�zec
str_replace -- Nahradit v�echny v�skyty jednoho �et�zce dal��m �et�zcem
str_rot13 -- Perform the rot13 transform on a string
str_shuffle -- Randomly shuffles a string
str_split -- Convert a string to an array
str_word_count -- Return information about words used in a string
strcasecmp -- Bin�rn� bezpe�n� case-insensitive porovn�n� �et�zc�
strchr -- Naj�t prvn� v�skyt znaku
strcmp -- Bin�rn� bezpe�n� porovnat �et�zce
strcoll -- Locale based string comparison
strcspn -- Naj�t d�lku �vodn�ho segmentu neodpov�daj�c�ho masce
strip_tags -- Odstranit z �et�zce HTML a PHP tagy
stripcslashes -- Un-quote string quoted with addcslashes()
stripos -- Find position of first occurrence of a case-insensitive string
stripslashes -- Zru�it escapov�n� proveden� funkc� addslashes()
stristr -- strstr() bez rozli�en� velikosti p�smen
strlen -- Zjistit d�lku �et�zce
strnatcasecmp -- Case-insensitive textov� porovn�n� s vyu�it�m "natural order" algoritmu
strnatcmp -- Porovn�n� �et�zc� algoritmem "p�irozen�ho t��d�n�"
strncasecmp -- Bin�rn� bezpe�n� case-insensitive porovn�n� prvn�ch n znak� �et�zc�
strncmp -- Bin�rn� bezpe�n� porovn�n� prvn�ch n znak� v �et�zc�ch
strpbrk -- Search a string for any of a set of characters
strpos -- Naj�t pozici prvn�ho v�skytu �et�zce
strrchr -- Naj�t posledn� v�skyt znaku v �et�zci
strrev -- Obr�tit �et�zec
strripos -- Find position of last occurrence of a case-insensitive string in a string
strrpos -- Naj�t pozici posledn�ho v�skytu znaku v �et�zci
strspn -- Zjistit d�lku �vodn�ho segmentu odpov�daj�c�ho masce
strstr -- Naj�t prvn� v�skyt �et�zce
strtok -- Tokenize string
strtolower -- Zm�nit �et�zec na mal� p�smena
strtoupper -- Zm�nit �et�zec na velk� p�smena
strtr -- P�elo�it ur�it� znaky
substr_compare -- Binary safe optionally case insensitive comparison of 2 strings from an offset, up to length characters
substr_count -- Spo��tat po�et v�skyt� �et�zce
substr_replace -- Nahradit ��st �et�zce jin�m �et�zcem
substr -- Vr�tit ��st �et�zce
trim -- Odstranit netisknuteln� znaky ze za��tku a konce �et�zce
ucfirst -- Zm�n� prvn� p�smeno �et�zce na velk�
ucwords -- Zm�nit prvn� znak ka�d�ho slova v �et�zci na velk� p�smeno
vprintf -- Output a formatted string
vsprintf -- Return a formatted string
wordwrap -- Zal�mat �et�zec na dan� po�et znak� pomoc� break znaku

add a note User Contributed Notes
Funkce pro pr�ci s �et�zci

andy a t onesandzeros d o t biz
09-Nov-2004 10:54


I use these little doo-dads quite a bit. I just thought I'd share them and maybe save someone a little time. No biggy. :)



// returns true if $str begins with $sub

function beginsWith( $str, $sub ) {

    return ( substr( $str, 0, strlen( $sub ) ) == $sub );

}



// return tru if $str ends with $sub

function endsWith( $str, $sub ) {

    return ( substr( $str, strlen( $str ) - strlen( $sub ) ) == $sub );

}



// trims off x chars from the front of a string

// or the matching string in $off is trimmed off

function trimOffFront( $off, $str ) {

    if( is_numeric( $off ) )

        return substr( $str, $off );

    else

        return substr( $str, strlen( $off ) );

}



// trims off x chars from the end of a string

// or the matching string in $off is trimmed off

function trimOffEnd( $off, $str ) {

    if( is_numeric( $off ) )

        return substr( $str, 0, strlen( $str ) - $off );

    else

        return substr( $str, 0, strlen( $str ) - strlen( $off ) );

}

[tab!]
27-Oct-2004 07:29


//

// string strtrmvistl(string str, [int maxlen = 64])

// 

// like strtrmvistl(). returns only the start and end chunk 

// in an array for further processing. 

//



function strtrmvistl_a($str, $maxlen = 64) {

    $res = array('start' => $str, 'end' => 0);          



    if(($len = strlen($str = chop($str))) > ($maxlen = max($maxlen, 12))) {

        $res['start'] = substr($str, 0, $maxlen - 3);



        if($len > ($maxlen - 3)) {

            $endlen = min(($len - strlen($res['start'])), $maxlen - 3);

            $res['start'] .= "...";

            $res['end'] = "..." . substr($str, $len - $endlen);

        }

    }



    return($res);

}

[tab!]
27-Oct-2004 07:29


//

// string strtrmvistl(  string str, [int maxlen = 64], 

//                      [bool right_justify = false],

//                      [string delimter = "<br>\n"])

// 

// splits a long string into two chunks (a start and an end chunk) 

// of a given maximum length and seperates them by a given delimeter. 

// a second chunk can be right-justified within maxlen.

// may be used to 'spread' a string over two lines.

//



function strtrmvistl($str, $maxlen = 64, $right_justify = false, $delimter = "<br>\n") {

    if(($len = strlen($str = chop($str))) > ($maxlen = max($maxlen, 12))) {

        $newstr = substr($str, 0, $maxlen - 3);



        if($len > ($maxlen - 3)) {

            $endlen = min(($len - strlen($newstr)), $maxlen - 3);

            $newstr .= "..." . $delimter;



            if($right_justify)

                $newstr .= str_pad('', $maxlen - $endlen - 3, ' ');



            $newstr .= "..." . substr($str, $len - $endlen);

        }



        return($newstr);

    }



    return($str);

}

[tab!]
27-Oct-2004 07:27


//

// string strtrmvis(string str, [int maxlen = 64])

// 

// truncate a long string to a given maximum length by inserting

// a placeholder in the middle

//



function strtrmvis($str, $maxlen = 64) {

    if(strlen($str = chop($str)) > ($maxlen = max($maxlen, 12))) {

        $chunklen = ($maxlen / 2);

        $str = substr($str, 0, $chunklen - 2) . ".. .." . 

            substr($str, $chunklen - (2 * $chunklen) + 3, $chunklen);

    }



    return($str);

}

[tab!]
27-Oct-2004 07:26


//

// string strtrevis(string str, [int maxlen = 64])

// 

// truncate a long string to a given maximum length by appending

// a placeholder at the end

//



function strtrevis($str, $maxlen = 64) {

    if(strlen($str = chop($str)) > ($maxlen = max($maxlen, 6)))

        $str = substr($str, 0, $maxlen - 3) . "...";



    return($str);

}

terry dot greenlaw at logicalshift dot com
12-Aug-2004 05:52


Here's a simpler "simplest" way to toggle through a set of 1..n colors for web backgrounds:





<?php


$colours = array('#000000', '#808080', '#A0A0A0', '#FFFFFF');





// Get a colour


$color = next($colors) or $color = reset($colors);


?>





The code doesn't need to know anything about the number of elements being cycled through. That way you won't have to tracking down all the code when changing the number of colors or the color values.

add a note


	downloads \| documentation \| faq \| getting help \| mailing lists \| \| php.net sites \| links \| my php.net

search for in the