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 CodeThe code is as follows:
$somevar = << Put your code or words here
Someword;
This is a 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 any character that represents the meaning of a token. <<
can be used to include both single and double quotes in an assignment en PW Many of this
http://www.bkjia.com/phpjc/322097.html www.bkjia.com true Span id= "Isbasedonurl" itemprop= "Isbasedonurl" >http://www.bkjia.com/phpjc/322097.html techarticle finishing up 2 for everyone to learn the difference between 1, three equals and two equals "= = = "VS" = = "For example, you have a function that returns these situations: 1, more than 0 of the number 2, less than 0 of the number 3, etc...
