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                對于提交/返回值,盡可能的使用===來檢查類型是否匹配,這一點對于區分FALSE,NULL, '',0四種空值尤其有用(定義了的變量但未定義值,其值為NULL)。函數返回值請用TRUE和FALSE來代替1和0 。 對于比較字符串,必須使用strcmp()或者===,這樣才進行類型檢查。例如:var_dump('01' == 1),返回結果為true,但是var_dump('01' === 1)的結果就是false了 對于in_array()函數,請加入第三個參數,設置為true,例如: in_array('01', array('1')),將不判斷類型,返回結果為true。但是如果使用in_array('01', array('1'), true),將判斷類型,返回結果為false。
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