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Filename : phptextClass.php
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<?php

/*phptext class, version 1.0

created by www.w3schools.in (Gautam kumar)

April 26, 2014

*/

class phptextClass

{	

	public function phptext($text,$textColor,$backgroundColor='',$fontSize,$imgWidth,$imgHeight,$dir,$fileName)

	{

		/* settings */

		$font = './calibri.ttf';/*define font*/

		$textColor=$this->hexToRGB($textColor);	

		

		$im = imagecreatetruecolor($imgWidth, $imgHeight);	

		$textColor = imagecolorallocate($im, $textColor['r'],$textColor['g'],$textColor['b']);	

		

		if($backgroundColor==''){/*select random color*/

			$colorCode=array('#56aad8', '#61c4a8', '#d3ab92');

			$backgroundColor = $this->hexToRGB($colorCode[rand(0, count($colorCode)-1)]);

			$backgroundColor = imagecolorallocate($im, $backgroundColor['r'],$backgroundColor['g'],$backgroundColor['b']);

		}else{/*select background color as provided*/

			$backgroundColor = $this->hexToRGB($backgroundColor);

			$backgroundColor = imagecolorallocate($im, $backgroundColor['r'],$backgroundColor['g'],$backgroundColor['b']);

		}

		

		imagefill($im,0,0,$backgroundColor);	

		list($x, $y) = $this->ImageTTFCenter($im, $text, $font, $fontSize);	

		imagettftext($im, $fontSize, 0, $x, $y, $textColor, $font, $text);

		if(imagejpeg($im,$dir.$fileName,90)){/*save image as JPG*/

			return json_encode(array('status'=>TRUE,'image'=>$dir.$fileName));

		imagedestroy($im);	

		}

	}	

	

	public function phpcaptcha($textColor,$backgroundColor,$imgWidth,$imgHeight,$noiceLines=0,$noiceDots=0,$noiceColor='#162453')

	{	

		/* Settings */

		$text=$this->random();

		$font = './font/monofont.ttf';/* font */

		$textColor=$this->hexToRGB($textColor);	

		$fontSize = $imgHeight * 0.75;

		

		$im = imagecreatetruecolor($imgWidth, $imgHeight);	

		$textColor = imagecolorallocate($im, $textColor['r'],$textColor['g'],$textColor['b']);			

		

		$backgroundColor = $this->hexToRGB($backgroundColor);

		$backgroundColor = imagecolorallocate($im, $backgroundColor['r'],$backgroundColor['g'],$backgroundColor['b']);

				

		/* generating lines randomly in background of image */

		if($noiceLines>0){

		$noiceColor=$this->hexToRGB($noiceColor);	

		$noiceColor = imagecolorallocate($im, $noiceColor['r'],$noiceColor['g'],$noiceColor['b']);

		for( $i=0; $i<$noiceLines; $i++ ) {				

			imageline($im, mt_rand(0,$imgWidth), mt_rand(0,$imgHeight),

			mt_rand(0,$imgWidth), mt_rand(0,$imgHeight), $noiceColor);

		}}				

				

		if($noiceDots>0){/* generating the dots randomly in background */

		for( $i=0; $i<$noiceDots; $i++ ) {

			imagefilledellipse($im, mt_rand(0,$imgWidth),

			mt_rand(0,$imgHeight), 3, 3, $textColor);

		}}		

		

		imagefill($im,0,0,$backgroundColor);	

		list($x, $y) = $this->ImageTTFCenter($im, $text, $font, $fontSize);	

		imagettftext($im, $fontSize, 0, $x, $y, $textColor, $font, $text);		



		imagejpeg($im,NULL,90);/* Showing image */

		header('Content-Type: image/jpeg');/* defining the image type to be shown in browser widow */

		imagedestroy($im);/* Destroying image instance */

		if(isset($_SESSION)){

			$_SESSION['captcha_code'] = $text;/* set random text in session for captcha validation*/

		}

	}

	

	/*for random string*/

	protected function random($characters=6,$letters = '23456789bcdfghjkmnpqrstvwxyz'){

		$str='';

		for ($i=0; $i<$characters; $i++) { 

			$str .= substr($letters, mt_rand(0, strlen($letters)-1), 1);

		}

		return $str;

	}	

	

	/*function to convert hex value to rgb array*/

	protected function hexToRGB($colour)

	{

			if ( $colour[0] == '#' ) {

					$colour = substr( $colour, 1 );

			}

			if ( strlen( $colour ) == 6 ) {

					list( $r, $g, $b ) = array( $colour[0] . $colour[1], $colour[2] . $colour[3], $colour[4] . $colour[5] );

			} elseif ( strlen( $colour ) == 3 ) {

					list( $r, $g, $b ) = array( $colour[0] . $colour[0], $colour[1] . $colour[1], $colour[2] . $colour[2] );

			} else {

					return false;

			}

			$r = hexdec( $r );

			$g = hexdec( $g );

			$b = hexdec( $b );

			return array( 'r' => $r, 'g' => $g, 'b' => $b );

	}		

		

	/*function to get center position on image*/

	protected function ImageTTFCenter($image, $text, $font, $size, $angle = 8) 

	{

		$xi = imagesx($image);

		$yi = imagesy($image);

		$box = imagettfbbox($size, $angle, $font, $text);

		$xr = abs(max($box[2], $box[4]));

		$yr = abs(max($box[5], $box[7]));

		$x = intval(($xi - $xr) / 2);

		$y = intval(($yi + $yr) / 2);

		return array($x, $y);	

	}

}

?>