PHP switch Statement switch case Learn notes

Switch statements in PHP are used to perform different actions based on multiple different conditions. If you want to selectively execute one of several blocks of code, use a Switch statement.

Switch syntax

The code is as follows

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switch (expression)//Set expression { Case Label1://Compare the value of label 1 Code to is executed if expression = Label1; If matching the output associated with the code Break End code Jump statement Case LABEL2://Compare the value of label 1 Code to is executed if expression = Label2; Break Default://If no match, execute defaults Code to IS executed If expression is different From both Label1 and Label2; }

Working principle:

Evaluate an expression (usually a variable) once
Compare the value of an expression with the value of a case in a structure
If there is a match, the code associated with the case is executed
After the code executes, the break statement blocks the code from jumping into the next case to continue execution
If no case is true, the default statement is used

The code is as follows	Copy Code
<?php $x = 1; The variable x is assigned a value of 4 Switch ($x) { Case 1://The value to be compared is 1 echo "Number 1"; Break Case 2://The value to be compared is 2 echo "Number 2"; Break Case 3://The value to be compared is 3 echo "Number 3"; Break Default://No match is matched, output defaults echo "does not have a number from 1 to 3"; } ?>

Learning experience, SWICTH case is just a switch statement, if there are many conditions or a variety of circumstances we can not use it, then we need to use if else to operate.