Organize out 2 to learn from everyone
1, three equals sign and two equals sign difference "= = =" VS "= ="
For example, you'll get a function that returns these kinds of situations:
1, more than 0 of the number
2, less than 0 of the number
3, equals 0 of the number (that is, 0)
4, False (On Failure)
At this time if you want to capture the failure, you must use = = = And not use = =
because = = In addition to match the 4th case, will also match the 3rd case, because 0 is also false!
In a
$a = ' 2 ';//character 2
$b =2;//Numerical Model 2
$a = = $b, it's right, it's all 2.
$a = = = $b, is wrong, because $ A is a character $b is numeric, the value is the same, but the type is different.
2. What does three angle brackets in PHP do? "<<<"
Copy the Code code as follows:
$somevar = <<
Put your code or words here
Someword;
This is the code snippet. The advantage of using code snippets in PHP is that when you need to output a piece of code (which can include multiple lines), the snippet can maintain a more logical pattern. Often used to insert HTML code.
Note that Someword is an arbitrary character that represents the meaning of a token. <<
Can be used to assign a value that contains both single and double quotes en pw many of this
The above describes the Photoshop CS2 v9.0 green Chinese version of Php some of the minor issues, including the Photoshop CS2 v9.0 Green Chinese version of the content, I hope that the PHP tutorial interested in a friend helpful.
