$id1			= $content->participants[0]->summonerId;
if(empty($id1)) header("Location:../404.html"); 
$id2			= $content->participants[1]->summonerId;
$id3		= $content->participants[2]->summonerId;
$id4		= $content->participants[3]->summonerId;
$id5		= $content->participants[4]->summonerId;
$id6			= $content->participants[5]->summonerId;
$id7		= $content->participants[6]->summonerId;
$id8		= $content->participants[7]->summonerId;
$id9		= $content->participants[8]->summonerId;
$id10			= $content->participants[9]->summonerId;

$tmpArray = array();
for($i=0;$i<10;$i++){
if ( $i==0 ){
$tmpStr = ${$id};
} else {
$tmpStr = ${$id. $i};
}
   
$json_urlx 		= "https://localhost/by-summoner/$tmpStr/entry?api_key=7cc4162d-46a5-41ed-bd8f-783a18fc1c87";
$json_datax		= file_get_contents($json_urlx);
$contentx		= json_decode($json_datax, true);
$db1 			= $contentx[$tmpStr]; 
$db1 			= $db1[0]; 
$tier			= $db1['tier']; 

    
$tmpArray[$i] = $tier;

    //$tmpStr boş geliyor hocam
}

<?php
$id1            = $content->participants[0]->summonerId; 
if(empty($id1)) header("Location:../404.html");  
$id2            = $content->participants[1]->summonerId; 
$id3        = $content->participants[2]->summonerId; 
$id4        = $content->participants[3]->summonerId; 
$id5        = $content->participants[4]->summonerId; 
$id6            = $content->participants[5]->summonerId; 
$id7        = $content->participants[6]->summonerId; 
$id8        = $content->participants[7]->summonerId; 
$id9        = $content->participants[8]->summonerId; 
$id10            = $content->participants[9]->summonerId; 

$tmpArray = array(); 
for($i=1;$i<=10;$i++){
	$tmpStr = ${'id'.$i}; 
    
	$json_urlx       = "https://localhost/by-summoner/$tmpStr/entry?api_key=7cc4162d-46a5-41ed-bd8f-783a18fc1c87"; 
	$json_datax      = file_get_contents($json_urlx); 
	$contentx        = json_decode($json_datax, true); 
	$db1             = $contentx[$tmpStr];  
	$db1             = $db1[0];  
	$tier            = $db1['tier'];  
	
	$tmpArray[$i] = $tier;
} 


print_r( $tmpArray );