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                            1.0==false
~~~
if(1==false){
    return 1;
}else{
    return 2;
}
結果輸出為2
if(0==false){
    return 1;
}else{
    return 2;
}
結果輸出為1
if(0===false){
    return 1;
}else{
    return 2;
}
結果輸出為2
~~~
2.array_search
~~~
$key = array_search($val,[1,2,3]);
if($key===false){
    return 1;
}else{
    return $key ;
}
若$val=5,則輸出結果為1；若$val=1,則輸出0
~~~
3.!==與===相對應，包括數據類型
```
x == y等于如果 x 等于 y，則返回 true5==8 返回 false
x === y絕對等于如果 x 等于 y，且它們類型相同，則返回 true5==="5" 返回 false
x != y不等于如果 x 不等于 y，則返回 true5!=8 返回 true
x !== y絕對不等于如果 x 不等于 y，或它們類型不相同，則返回 true5!=="5" 返回 true

```





                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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