Eurler 2 (not tested)

gistfile1.c

unsigned int dd_eurler_2(){
    
    int a = 1;
    int b = 2;
    int sum = 0, response = 0;
    
    for ( int i=0; a<4000000; i++ ) {
    
        sum = a + b;
        a = b;
        b = sum;
        
        if ( a % 2 == 0 ){
                
            response+=a;
            
        }
    }
    return response;
}

PHP version

 <?php 
    $a = 1;
    $b = 2;
    $sum = 0;
    $response = 0;
    
    for ( $i=0; $a<4000000; $i++ ) {
    
        $sum = $a + $b;
        $a = $b;
        $b = $sum;
        
        if ( $a % 2 == 0 ){
                
            $response+=$a;
            
        }
    }
    echo $response;