strcspn

(PHP 4, PHP 5)

strcspn — Encuentra la longitud del elemento inicial que no coincide con la máscara

Descripción

int strcspn ( string $cadena1 , string $cadena2 [, int $comienzo [, int $final ]] )

Devuelve la longitud del segmento inicial de cadena1 que no contiene ninguno de los caracteres de cadena2 .

Desde la versión de PHP 4.3.0, la función strcspn() acepta 2 parámetros opcionalesde tipo integer que se emplean para definir el comienzo y final de la cadena que se debe examinar.

Note: Esta función es segura binariamente.

Vea también strspn().

strip_tags

strcoll

Last updated: Fri, 26 Dec 2008

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strcspn

PHP at NospamImmortalSoFar dot com
08-Oct-2006 01:31


Also useful for breaking down expressions - for example parsing SQL: values ('this', fn("that,)()", 4))



$sep = strcspn ($list, "'\"`");     //    Start of quoted string

$list = substr ($list, $sep);

$find = substr ($list, 0, 1);

while (($sep = strpos ($list, $find, $sep+1)) > 0 && substr ($list, $sep-1, 1) == '\\')

    {}

//  $sep now spans the entire string, regardless of embedded quotes



Once the strings have been removed, an expression can then be parsed for commas and brackets without worrying about them:



while ($out != '')

{

    $sep = strcspn ($list, "(),");      //  Next seperator

...

}

AT-HE (at_he AT hotmai1 DOT com)
27-Dec-2005 10:07


this function can be used like strspn(), except while that can be used to compare a string with an allowed pattern, this one can be use to compare a string with a FORBIDDEN pattern



so, to know if any forbidden character has a position inside our string, we can use (not tested with backslashes)...



<?php

// LARGE VERSION

$forbidden="\"\\?*:/@|<>";

if (strlen($filename) != strcspn($filename,$forbidden)) {

    echo "you cant create a file with that name!";

}



// SHORT VERSION

if (strlen($filename) - strcspn($filename,"\"\\?*:/@|<>")) {

    echo "i told you, you cant create that file";

}

?>

maskedcoder at hotmail dot com
10-Oct-2005 11:13


useful for finding beginning of quotes and/or tags in a variable containing html.  

    $pos = strcspn($data, '<"\''); 

will find the first occurance of either the beginning of a tag, or a double- or single-quoted string.

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strip_tags

strcoll

Last updated: Fri, 26 Dec 2008