$message.='<img src="https://'.$_SERVER['HTTP_HOST'].'/image.php?text='.urlencode('пример текста').'&image=picture_name"/>';

<?php
if($_GET['text']&&$_GET['image']){
	header("Content-type: image/jpeg");
	$bg=$_SERVER['DOCUMENT_ROOT']."/images/".$_GET['image'].".jpg";
	$font=$_SERVER['DOCUMENT_ROOT']."/fonts/font.ttf";
	$picture=imagecreatefromjpeg($bg);
	$center_w=imagesx($picture)/2;
	$center_h=imagesy($picture)/2;
	$color=imagecolorallocate($picture,255,255,255);
	$box=imagettfbbox(9,0,$font,$_GET['text']);
	$left=$center_w-round(($box[2]-$box[0])/2);
	$top=$center_h-round(($box[7]-$box[1])/2);
	imagettftext($picture,9,0,$left,$top,$color,$font,$_GET['text']);
	imagejpeg($picture,null,100);
	imagedestroy($picture);
}
?>

function GetListFiles($folder,&$all_files){
	$fp=opendir($folder);
	while($cv_file=readdir($fp)){
		if(is_file($folder."/".$cv_file)){
			$all_files[]=$folder."/".$cv_file;
		}
		elseif($cv_file!="."&&$cv_file!=".."&&is_dir($folder."/".$cv_file)){
			GetListFiles($folder."/".$cv_file,$all_files);
		}
	}
	closedir($fp);
}
$all_files=array();
GetListFiles('/var/www/import_files',$all_files);
print_r($all_files);

function colorSearchWord($word,$string,$color='violet'){
	return preg_replace('|('.preg_quote($word).')|si','<span style="color:'.$color.';border-bottom:1px dashed '.$color.';">$1</span>',$string);
}

function colorSearchWord($word,$string,$color='violet'){
	$replacement="<span style='color:".$color."; border-bottom:1px dashed ".$color.";'>".$word."</span>";
	$result=str_replace($word,$replacement,$string);
	return $result;
}

function colorSearchWord($word,$string,$color='violet'){
	$replacement="<span style='color:".$color."; border-bottom:1px dashed ".$color.";'>".$word."</span>";
	$result=str_ireplace($word,$replacement,$string);
	return $result;
}

if(preg_match('/^[а-яё]++$/ui',$letter)){
	//...
}

function format_url($url){
	$result=array();
	$pu=parse_url($url);
	if($pu['query']){
		$parts=explode('&',html_entity_decode($pu['query']));
		foreach($parts as $part){
			$param=explode('=',$part);
			$result[$param[0]]=$param[1];
		}
	}
	return $result;
}

print_r(format_url($url));

function format_url($url){
	$result=$url;
	$arr=array();
	$pu=parse_url($url);
	if($pu['query']){
		$parts=explode('&',html_entity_decode($pu['query']));
		foreach($parts as $part){
			$param=explode('=',$part);
			$arr[$param[0]]=$param[1];
		}
		if($arr['section']&&$arr['element']){
			$result='/section/'.$arr['section'].'/'.$arr['element'].'.html';
		}
	}
	return $result;
}

function sgp($url,$varname,$value){
	if(is_array($varname)){
		foreach($varname as $i=>$n){
			$v=(is_array($value))?(isset($value[$i])?$value[$i]:NULL):$value;
			$url=sgp($url,$n,$v);
		}
		return $url;
	}
	preg_match('/^([^?]+)(\?.*?)?(#.*)?$/',$url,$matches);
	$gp=(isset($matches[2]))?$matches[2]:'';
	if(!$gp)return $url;
	$pattern="/([?&])$varname=.*?(?=&|#|\z)/";
	if(preg_match($pattern,$gp)){
		$substitution=($value!=='')?"\${1}$varname=".preg_quote($value):'';
		$newgp=preg_replace($pattern,$substitution,$gp);
		$newgp=preg_replace('/^&/','?',$newgp);
	}
	else{
		$s=($gp)?'&':'?';
		$newgp=$gp.$s.$varname.'='.$value;
	}
	$anchor=(isset($matches[3]))?$matches[3]:'';
	$newurl=$matches[1].$newgp.$anchor;
	$newurl=rtrim($newurl,'&');
	$newurl=str_replace('&&','&',$newurl);
	$newurl=str_replace('?&','?',$newurl);
	return $newurl;
}

<a href="<?=sgp($url,'key',$value)?>">test</a>

<a href="<?=sgp($url,'key','')?>">test</a>

<a href="<?=sgp($url,array('key1','key2'),array($value1,$value2))?>">test</a>

<a href="<?=sgp($url,array('key1','key2'),NULL)?>">test</a>

$x=rand(108,115)/100;