advanced preg_replace help needed

**Zaggs** · May 6, 2008, 08:51

Hi Guys,

I am trying to parse html templates which contain nested php variables which should be parsed into functions and then executed. I am using the following code:

HTML content to be parsed:

HTML Code:

<html>{$dtsettings[ShowSecurityImage]}</html>

PHP parsing code:

PHP Code:


$template = preg_replace('/\{\$dtsettings\[(.*?)\]\}/e', '$this->dtsettings["$1"]', $template);

The output gives:

Code:

$this->ShowSecurityImage();

As you can see the output is not what im looking for - the function is correct but the PHP code is being displayed as opposed to being executed. How can I make the PHP execute?

Thanks in advance.

**FrlB** · May 6, 2008, 12:42

Have you tried eval?
http://www.php.net/eval

**Zaggs** · May 6, 2008, 12:47

Originally Posted by FrlB

Have you tried eval?
http://www.php.net/eval

Hi - I realise that I need to use eval just not sure how this can be implemented into my code, any ideas?

**FrlB** · May 6, 2008, 14:45

I'm not sure I understand your problem, but eval evaluates strings - so try something like:
eval("$this->ShowSecurityImage()");
or
eval($template)
But I'm not sure whether this works in classes (I have no PHP here at the moment to verify).

**Zaggs** · May 6, 2008, 15:06

Im using eval within a class and it gives the following error when i use eval($template);

Code:

Parse error: syntax error, unexpected '<' in /home/domaintr/public_html/functions/main.class.php(91) : eval()'d code on line 1

**logic_earth** · May 6, 2008, 15:09

I assume you are using a class so...

PHP Code:


class Sometest

{

    protected function getVaraible ( $m )

    {

        list( , $prop, $key ) = $m;

        if ( property_exists( $this, $prop ) ) {

            return empty( $key ) ? $this->{$prop} : $this->{$prop}[ $key ];

        }

    }



    public function parse ( $str )

    {

        $str = preg_replace_callback( '/{$(dtsettings)\[(.*?)]}/', array( $this, 'getVaraible' ), $str );

        return $str;

    }

}

**Zaggs** · May 6, 2008, 15:55

Originally Posted by logic_earth

I assume you are using a class so...

PHP Code:


class Sometest

{

    protected function getVaraible ( $m )

    {

        list( , $prop, $key ) = $m;

        if ( property_exists( $this, $prop ) ) {

            return empty( $key ) ? $this->{$prop} : $this->{$prop}[ $key ];

        }

    }



    public function parse ( $str )

    {

        $str = preg_replace_callback( '/{$(dtsettings)\[(.*?)]}/', array( $this, 'getVaraible' ), $str );

        return $str;

    }

}

Hi - Thanks for your reply, but I am trying to get this working on PHP4 +

I have managed to get my script executing the PHP code using eval, but my problem is now with the output buffer in the parse function. Here is the function I am using;

PHP Code:


function parse_template($template) {

        // Header fix

        ob_start();

        $template = preg_replace('/\{\$dtsettings\[(.*?)\]\}/e', 'eval($this->dtsettings["$1"])', $template);

        $template = ob_get_clean();

        return $template;

    }

The problem is that only the output of the ShowSecurityImage() function is being output (the original value of $template is being lost).

I think it may be due to the ob_get_clean() buffer, but I think this is needed otherwise I received errors? Any idea how to fix this?

Thanks in advance.

**logic_earth** · May 6, 2008, 17:36

PHP 4....ehhh

Don't use eval or the e modifier well you can but it is far less readable and maintainable.

PHP Code:


class Sometest

{

    function getVaraible ( $m )

    {

        list( , $prop, $key ) = $m;

        if ( isset( $prop ) ) {

            return empty( $key ) ? $this->{$prop} : $this->{$prop}[ $key ];

        }

    }



    function parse ( $str )

    {

        return preg_replace_callback( '/{$(dtsettings)\[(.*?)]}/', array( $this, 'getVaraible' ) , $str );

    }

}

**Zaggs** · May 7, 2008, 03:34

Originally Posted by logic_earth

PHP 4....ehhh

Don't use eval or the e modifier well you can but it is far less readable and maintainable.

PHP Code:


class Sometest

{

    function getVaraible ( $m )

    {

        list( , $prop, $key ) = $m;

        if ( isset( $prop ) ) {

            return empty( $key ) ? $this->{$prop} : $this->{$prop}[ $key ];

        }

    }



    function parse ( $str )

    {

        return preg_replace_callback( '/{$(dtsettings)\[(.*?)]}/', array( $this, 'getVaraible' ) , $str );

    }

}

Hi Logic,

Thank you for your help, but im now getting this error;

Code:

Notice: Undefined property: myClass::${$dtsettings[ShowSecurityImage]} in /home/username/public_html/functions/main.class.php on line 72

**Zaggs** · May 7, 2008, 04:09

I managed to get it working but as the output of the ShowSecurityImage(); is an image, im receving the following errors;

Code:

Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/register.php:80) in /home/domaintr/public_html/functions/main.class.php on line 153

Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/register.php:80) in /home/domaintr/public_html/functions/main.class.php on line 156

Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/register.php:80) in /home/domaintr/public_html/functions/main.class.php on line 159

Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/register.php:80) in /home/domaintr/public_html/functions/main.class.php on line 160

Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/register.php:80) in /home/domaintr/public_html/functions/main.class.php on line 163

Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/register.php:80) in /home/domaintr/public_html/functions/main.class.php on line 166
ÿØÿàJFIFÿþ>CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), default quality ÿÛC    $.' ",#(7),01444'9=82<.342ÿÛC  2!!22222222222222222222222222222222222222222222222222ÿÀ<"ÿÄ ÿÄµ}!1AQa"q2‘¡#B±ÁRÑð$3br‚ %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyzƒ„…†‡ˆ‰Š’“”•–—˜™š¢£¤¥¦§¨©ª²³´µ¶·¸¹ºÂÃÄÅÆÇÈÉÊÒÓÔÕÖ×ØÙÚáâãäåæçèéêñòóôõö÷øùúÿÄ ÿÄµw!1AQaq"2B‘¡±Á #3RðbrÑ $4á%ñ&'()*56789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz‚ƒ„…†‡ˆ‰Š’“”•–—˜™š¢£¤¥¦§¨©ª²³´µ¶·¸¹ºÂÃÄÅÆÇÈÉÊÒÓÔÕÖ×ØÙÚâãäåæçèéêòóôõö÷øùúÿÚ ?÷)šò ç@rê¿êOvûÞõÜÍÃE-Ý¬xE`^23’G÷ý¿Zçþ!x–_ Ùhr«ÛEî³mis5ÁÀŠË3:ž1šÊ·ñ\ºÏÄ‰´ok]ÜDûH½Àº (¸ U¼·@FÃœdH9#Šëg¼Æuo*–| £î°=KàgüjEÕKAæªÚ“°¿–.>lœcoZâõ?ø¾ÇÄßØºtšFµsœó]%½„°ýšO(µº»Ùs#»ÁÚ àˆ_Çòk:'šÂ8n/µË”PˆeU"0»1äŽPôäç°jô kKicw’Þ'c,™f@IùÍ$ñZÚMm(ŽGšAp¡xØÝëÌ´oˆz¶£aÇªøjËTžöHÎ…}©qó™|¶HNòºê@ÛZ¾ ñ‰´ÿøsJ‚÷I’^[¯)ÛL”<>Rp7q;±Ÿ—¦}¨³Žê'VgÔÂî† u˜©-¯‡æy$!˜oXYƒÄ•éŽ•Æx§Vñ/‡<8.Mæ™¾5†+kVÓ]Þêç ¶4+q’YÁÀHs‚k¸Òd¾›F±—T†85·®¢ŒåRR£zŽO²:Ÿ© SÅ>»ñhRiÐØ[7[†úF‘Ê—HYÃµ'Ž¼V>¥á¯Œ®õ}}"Þïûû2ŸË ™$2‚v±Ç_˜rëèÖê[þºÉÿ¡µgMyž£$Ž®A,>P3÷bÿ §¡höÞÓmím-ßÊ[‡’yÚFšk‰ˆ`òÈÛrÌÇ©>À`+›ð¯¡Ð¼q©k <Óih\hÖ{’ÄÊwOµ6æ]‡î’k¾Ó¤ÙùŠ #‘ž¼¹ªÑÛ  ÓyvŸ4Ž¿5¾ãÄdÜô 7_ð÷‹|[àû¿^Ç£ÃÝÇÏ¨G<Èâ1p$Ü-Ú3ÎÕû¾n3üUk\Ð/µ?øSY…Qm4‹«Ï´p y¤"í®ç8ükªŽÖ!srAhêÈÏòÀ‚ ûŸZ»äCåyRyÜÚ6úô SÐ|D¾:ºñ[iz²!Ò’êöHZÄ¾nBë¹Û«gvÑŒãŠîà35¼MqqÎP7.ªØä 3ß>‚¨ßCkimç*¼jct9DýáÒ¢ÿ„†ÓþyÏùñ ÿÙ

**Zaggs** · May 8, 2008, 05:41

Still can't manage to get this working - anyone have any ideas?

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