en la función save de wordpress, mueve la imagen destacada a un directorio y agrega un texto

functions.php

<?php
function save_id_to_file($post_id){
 	//use your file creation/save function here
 	header ("Content-type: image/jpeg");
 	$path = "C:\TEMP";
 	$imageName = $path."\\meme-".$post_id.".png";
 	$imageNameFeat = $path."\\meme-".$post_id."-feat.png";
 	$elTitulo = get_field('conduccion');
 	

 	$urlFeaturred = wp_get_attachment_url( get_post_thumbnail_id($post->ID, 'thumbnail') );
 	$myFile = $path."\\testFile.txt";
	$fh = fopen($myFile, 'w') or die("can't open file");
	$stringData = "$elTitulo   --- $post_id ---- $urlFeaturred\n";
	fwrite($fh, $stringData);
	fclose($fh);
	$content = file_get_contents($urlFeaturred) or die ("Problemas");
	file_put_contents($imageName, $content) or die ("problemas copiando");

	$imgPath = $imageName;
    $image = imagecreatefrompng($imgPath);
    $color = imagecolorallocate($image, 255, 255, 255);
    $string = "$elTitulo";
    $fontSize = 3;
    $x = 0;
    $y = 0;
    imagestring($image, $fontSize, $x, $y, $string, $color);
    imagepng($image, $imageNameFeat);
?>

	return $post_id;
}

add_action('save_post','save_id_to_file');