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                            例:斐波那契數(第一個,第二個是2.后面數是前面2個數相加)

function f1($n) {
 $qian1=1;
 $qian2=1;
 for($i=3;$i<=$n;++$i) {
 $result=$qian1+$qian2;
 $qian1=$qian2;
 $qian2=$result;
 }
 echo $result;
}
f1(20);




                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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