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run code in 300+ PHP versions simultaneously

@ 2016-05-17T17:34:48Z

<?php
$relationships=array(
            array(70),
            array(70, 71),
            array(70, 71, 72),
			array(70, 71, 72),
            array(70, 71),
            array(80),
			array(70, 71),
            array(70, 71, 72),
            array(70, 71, 72),
            array(70, 71, 72),
            array(70, 71),
			array(70, 71, 72),
            array(70, 71, 72, 68)
        );

$old_count = 0;
$index = 0;
foreach($relationships as $val){ 	
	$tmp = array();
    $value = array();
	$count = count($val);
	if($count == 1){
		$old_count = 0;
		$level = array();		
		$index++;
		$level[] = $index;
	}
    	
	if($old_count == $count)
		$level[($count-1)] = ($level[($count-1)] == "" || $level[($count-1)] == null) ? 1 : ++$level[($count-1)];
	else if($old_count > $count){
		$level[($count-1)] = ($level[($count-1)] == "" || $level[($count-1)] == null) ? 1 : ++$level[($count-1)];
		for($j = $count; $j <= $old_count; $j++)
			$level[$j] = 1;
	}else
		$level[$count] = 1;	
    
	for($i = 0; $i < $count; $i++){
        $tmp[] = $level[$i];
    }
	$old_count = $count;
	echo "Indexes: ".implode(".", $tmp)."\n";	
}

Output for 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.14, 8.4.16 - 8.4.17, 8.5.0 - 8.5.2: Indexes: 1 Indexes: 1.1 Indexes: 1.1.1 Indexes: 1.1.2 Indexes: 1.2 Indexes: 2 Indexes: 2.1 Indexes: 2.1.1 Indexes: 2.1.2 Indexes: 2.1.3 Indexes: 2.2 Indexes: 2.2.1 Indexes: 2.2.1.1
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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