PHP Image display error - 


<?php      $im = imagecreatetruecolor(120, 20);      $text_color = imagecolorallocate($im, 233, 14, 91);      imagestring($im, 1, 5, 5,  'a simple text string', $text_color);       header('content-type: image/jpeg');       imagejpeg($im);       imagedestroy($im); ?>

this code displaying error-

the image"http://localhost/untitled.php" cannot displayed because contains errors.

i trying make image editor using php , here trying create image using php , upload in on server. code showing error stated above.

what problem don't understand.

<?php $my_img = imagecreate( 200, 80 ); $background = imagecolorallocate( $my_img, 0, 0, 255 ); $text_colour = imagecolorallocate( $my_img, 233, 14, 91 ); $line_colour = imagecolorallocate( $my_img, 233, 14, 91  ); imagestring( $my_img, 4, 30, 25, "a simple text string", $text_colour ); imagesetthickness ( $my_img, 5 ); imageline( $my_img, 30, 45, 165, 45, $line_colour );  header( "content-type: image/jpg" ); imagepng( $my_img ); //imagecolordeallocate( $line_color ); imagecolordeallocate( $text_color ); imagecolordeallocate( $background ); imagedestroy( $my_img ); ?>

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