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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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