<?php
/**
* Creates a GIF images of a string being typed 
* $string is the string that will be displayed (No line breakes)
* $delay is the time the before another character is typed
* $finaldelay is the time that the whole string should be displayed in the end before redrawing
* $output is the file that should be outputted to if let empty the image is outputted directly
*/

/*
* Use
<?php
GifCATCHA('Hello World',30,60,'myfile.gif);
?>
function GifCATCHA($string,$delay,$finaldelay,$output=false) {
	/* This object will hold the animation */
	$animation = new Imagick();
 
	/* Set the format to gif. All created images will be gifs*/
	$animation->setFormat( "gif" );
 
	/* Create a pixel to handle colors */
	$color = new ImagickPixel( "white" );
 
	/* The first frame */
	$color->setColor( "white" );
 
 
	/* Create a new ImagickDraw object and set the font
	    Text color defaults to black */
	$draw = new ImagickDraw();
 
	/* You can get configured fonts with $im->queryFonts 
	    or use /path/to/file.ttf */
	$draw->setFont( "Helvetica" );
 
	/* Loop trough the string.. */
	for ( $i = 0; $i <= strlen( $string ); $i++ )
	{
	    /* Take some characters for this frame */
	    $part = substr( $string, 0, $i );
	 
	    /* Create a new frame */
	    $animation->newImage( 100, 50, $color );
	    
	    /* Annotate the characters on the image */
	    $animation->annotateImage( $draw, 10, 10, 0, $part );
	 
	    /* Set a little higher delay for the frame*/
	    $animation->setImageDelay($delay);
	}
 
/* The last frame contains the same text with bold */
$draw->setFont( "Helvetica" );
 
/* One more frame */
$animation->newImage( 100, 50, $color );
 
/* Annotate the bold text on the image */
$animation->annotateImage( $draw, 10, 10, 0, $string );
 
/* The bold can be visible a little longer time */
$animation->setImageDelay($finaldelay);
 
if($output) {
	file_put_contents($output,$animation->getImagesBlob(),'w+');
} else {
	/* Display the output as an animation. 
		Use getImagesBlob to get all images combined */
	header( "Content-Type: image/gif" );
	echo $animation->getImagesBlob();
}
}
?>