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strlen

mail4adry at inwind dot it
21-Aug-2007 01:53


my last post was a biiiiig mistake. This is the right way to display a few words of an html formatted text, which is based on the functions of the previous post, strllen_Html and strlen_noHtml, that returns the string length counting tag-characters and non-tag-characters.



This can be useful to put a preview of an article on the front page when the rest of the article is displayed on another page:



function getPreviewText($text) {

    // Strip all tags

    $desc = strip_tags(html_entity_decode($text), "<a><em>");

    $charlen = 0; $crs = 0;

    if(strlen_HTML($desc) == 0)

        $preview = substr($desc, 0, 69);

    else

    {

        $i = 0;

        while($charlen < 80)

        {

            $crs = strpos($desc, " ", $crs)+1;

            $lastopen = strrpos(substr($desc, 0, $crs), "<");

            $lastclose = strrpos(substr($desc, 0, $crs), ">");

            if($lastclose > $lastopen)

            {

                // we are not in a tag

                $preview = substr($desc, 0, $crs);

                $charlen = strlen_noHTML($preview);

            }

            $i++;

        }

    }

    return $preview."&#8230;"

}



will display text cut as near as possible to character 80 respecting each <a> and <em> tags and ending with ...

mail4adry at inwind dot it
21-Aug-2007 09:39


// Strip all tags except links

$desc = strip_tags(html_entity_decode($description), "<a>");

// Cut the line to the right length

if(strlen_nohtml($desc) > 72)

      $desc = substr($desc, 0 , 71+strlen_html($desc))."&#8230;";



output something like a text interrupted by ... at car #71 containing active links

mail4adry at inwind dot it
21-Aug-2007 09:28


/**

 * return length of a string regardeless of html tags in it

 *

 * @param string $html

 * @return string

 */

function strlen_noHtml($string){

    $crs = 0;

    $charlen = 0;

    $len = strlen($string);

    while($crs < $len)

    {

        $offset = $crs;

        $crs = strpos($string, "<", $offset);

        if($crs === false)

        {

           $crs = $len;

           $charlen += $crs - $offset;

        }

        else

        {

            $charlen += $crs - $offset;

            $crs = strpos($string, ">", $crs)+1;

        }

    }

    return $charlen;

}



/**

 * return length of a string regarding html tags in it

 *

 * @param string $html

 * @return string

 */

function strlen_Html($string){

    $crs = 0;

    $charlen = 0;

    $len = strlen($string);

    while($crs < $len)

    {

        $scrs = strpos($string, "<", $crs);

        if($scrs === false)

        {

           $crs = $len;

        }

        else

        {

            $crs = strpos($string, ">", $scrs)+1;

            if($crs === false)

                $crs = $len;

            $charlen += $crs - $scrs;

        }

    }

    return $charlen;

}



Example:



$text = "<p>Test 'a' paragraph.</p><!-- Comment --> Other text";



echo "strlen without HTML chars:".strlen_noHtml($text);

echo "<br>";

echo "strlen of HTML chars:".strlen_html($text);



Will output:

strlen without HTML chars:30

strlen of HTML chars:23

Mike Rosoft
03-Jul-2007 07:12


The function "empty" tests whether a variable will evaluate as FALSE; the string '0' (as well as the number 0) does.



Another simple way of testing for an empty string is:



 if($string=='') foo();

  else bar();



This will match an empty string and anything that converts to it (such as NULL/unset variable), but not the number zero as either a number or a string.

bradmwalker at cableone dot net
01-Jul-2007 03:48


want a predicate that tests a string for emptiness? use strlen instead of empty(). strlen only returns a false-equivalent value for ''.



example:



// takes string_array and returns an array without any values w/empty strings

function filter_empties ($string_array) {

    // note: the immensely retarded empty() function returns true on string '0'

    // use strlen as empty string predicate

    return count($string_array) ? array_filter ($string_array, 'strlen') : $string_array;

}

topera at gmail dot com
27-Jun-2007 08:32


//------------------------------------------

// This function returns the necessary

// size to show some string in display

// For example:

// $a = strlen_layout("WWW"); // 49

// $a = strlen_layout("..."); // 16

// $a = strlen_layout("Hello World"); // 99

//------------------------------------------

function strlen_pixels($text) {

    /*

        Pixels utilized by each char (Verdana, 10px, non-bold)

        04: j

        05: I\il,-./:; <espace>

        06: J[]f()

        07: t

        08: _rz*

        09: ?csvxy

        10: Saeko0123456789$

        11: FKLPTXYZbdghnpqu

        12: A

strlen

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