I want to know how to replace variables of RTF file using PHP language.

Please help me....

Try get the RTF data , and apply eval().
Something like this:

$rtfdata = file_get_contents('file.rtf');
eval("\$rtfdata = \"$rtfdata\";");
echo $rtfdata;
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You need to be fat more specific with your needs. Are you talking about replacing RTF markup with html?

I have HotDocs created document where variables like this.

Name: «demo_Last name» «demo_First name»
DOB: «demo_DOB»
SSN: «demo_SSN»
Country: «Country Name» (Variables may include spaces.)

And also conditions like this:

«IF XYZ = "Some String"»
DRE I«ELSE IF XYZ = "Some other string"» DRE II
«ELSE IF XYZ = "else string"»DRE III«END IF»

«IF PQR = "1"» DRE I «ELSE IF PQR = "2"»DRE IV«ELSE IF PQR = "2" AND XYZ = "Some String"» Response«END IF»

Do I have to create something like compiler?

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So you want to replace code blocks and variables/placeholders with php/html code? You may need some heavy preg_replace use!

What about conditions??
And what if there are two variables in a condition?

«ELSE IF PQR = "2" AND XYZ = "Some String"»

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I really, really don't udnerstand what you're trying to achieve. The hotdoc is a template, specifically produced to work with a particular parser. Why do you need to change it to php?

echo <<<FOOBAR
Name: $lastname $firstname
DOB: $dob
SSN: $demo_SSN
Country: $Country_Name (Variables may include spaces.)

if($XYZ == "Some String"){
    echo "DRE I";
}elseif($XYZ == "Some other string"){
    echo "DRE II";
}elseif($XYZ == "else string"){
    echo "DRE III";

if($PQR == "1"){
    echo "DRE I";
}elseif($PQR == "2"){
    echo "DRE IV";
}elseif($PQR == "2" && $XYZ == "Some String"){
    echo "Response";

SOmething like that?

I can not change.
What I really want to do is that. I have RTF file. On the other hand I have an array of values to replace.

Thay way I want to achieve this goal is to open the file with fopen, and then replace variables with values, and also parse condition to show response.

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Ok, in that case, your best bet would be to convert the document to a php file and use that as an include file. Either that of use a proper php templating engine. There are many to choose from, the most popular being Smarty, RainTPL and the more recent Twig (which is REALLY cool).

For example, a twig html document would look like this:

Name: {{lastname}} {{$firstname}}
DOB: {{dob}}
SSN: {{demo_SSN}}
Country: {{Country_Name}} (Variables may include spaces.)

{% if XYZ == "Some String" %}
<p>DRE I</p>
{% elseif kenny.dead %}
<p>DRE II</p>
{% else %}
<p>DRE III</p>
{% endif %}

{% if PQR == "1" %}
<p>DRE I</p>
{% elseif PQR == "2" %}
<p>DRE IV</p>
{% elseif PQR == "2" && XYZ == "Some String" %}
{% endif %}

You could do something like this for the variables, but the conditional need some heavy duty manipulation:

$f = file_get_contents("txt.txt");

$array_values=array("lastname"=>"Gilbert", "firstname"=>"Rhod", "dob"=>"10/12/1976", "SSN"=> "64916541541NJ", "country_name"=> "Wales");
$vars =array("lastname"=> "demo_Last name", "firstname"=> "demo_First name", "dob"=>"demo_DOB", "SSN"=>"demo_SSN", "country_name"=> "Country Name");

$patternedvars = array_map('patternMe',$vars);

function patternMe($item){
    $item = '/«' . $item . '»/';
    return $item;   
$f = nl2br(preg_replace($patternedvars,$array_values,$f));
echo $f;

My problem is I cannot modify RTF file as there are many of them, and these file are using for other purposes too.

The only way I have to parse the file is using charrsid8996477 as it the only word which HotDocs is using as its start and end tags like this.

{\rtlch\fcs1 \af39\afs22 \ltrch\fcs0 
\f39\fs22\cf2\insrsid3348527\charrsid8996477 demo_DOB}

And also I could not find ending tag. Starting charrsid8996477 is given and it is ending with "}"

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How many are you talking about?
I can't see an easy way around this. Replacing just the if blocks could become a nightmare. It could also be the case where if conditions are a little more complex in some templates, so that your replacement fails.
A few hours converting these files manually may be quicker than writing a fance preg_replace routine that is likely to fail anyway.

There are about 30 files. And as I said these files are being used in other ways / other system. So modification of these files will create duplication, and when a single word in a file need to change, We will have to make these changes in my PHP files too.
To resolve this issue I wanted to use files as these files are provided to me.

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I really can't see a way of producing a 'duplicate' php file from these types of template file without writing a hefty custom parser.