as mentioned above, you can see the following line in the code: return $teacher_name ?: ---- ; What is the name of this operator, please? What does it mean? ...
What are the general uses of the bit operator? For example, to solve a problem, it is very simple to use the bit operator. ...
in other words, a > = b equals astatb | | a > b or a > b | | astatableb? ...
Integer a = 1; Integer b = 2; Long c = 3L; c = a compiler error will result in the error that int cannot be converted to long System.out.println (compiled normally, resulting in true Why? I know that when int and long add up, they both turn i...
found a very interesting phenomenon in PHP, but I don t know how to explain it. The code goes like this: $str1 = "01 "; $str1PP; echo $str1; 01 $str1 = "01"; $str1PP; echo $str1; 2 Why is it interesting ...
Click pull first, then pull successfully error will be reported as soon as it is pushed ...
<select name="class"> {foreach $res as $value} <option>{$value[ class ]}< option> { foreach} < select>...
recently I was looking at the knowledge related to io and encountered some minor problems. Here are some examples to illustrate the problem: for example: 12345 is a decimal number found according to ASCII code is binary 00110001 00110010 00110011 00...
What s the difference between function A () {} and var A = function A () {}. ...
after pressing the physical return button of the phone from page B to page A, the click event of the button on page A no longer works. Why, ask the boss to explain ...