


Notes on the basic syntax structure of PHP loop statements_PHP tutorial
There are many loop statements in PHP, such as: for, foreach, while, do while, goto statements. Let me briefly introduce the usage of these loop statement structures.
for loop control
for(initial value of loop; condition of loop; step size){
//Execute statement;
}
Example
The code is as follows | Copy code | ||||
";
} |
Output value
value is now 0
value is now 1value is now 2
In the first loop, $i=0, which means that the expression, ($i
In the second loop, $ = 1, which means that the expression, ($i
In the third iteration, $i= 2, which means that the expression, ($i In the fourth iteration, $i= 3, which means the expression, ($i
while loop
The basic grammatical structure is
while(loop condition){
//The loop condition value changes. If it is not added, it will become an infinite loop
代码如下 | 复制代码 |
"; $a++; }?> |
Example
The code is as follows | Copy code |
"; $a++; }?> |
do..while loop control
Basic grammatical structure
do{
//Execute statement;
//The loop condition value changes. If it is not added, it will become an infinite loop代码如下 | 复制代码 |
"; }while ($i |
The code is as follows | Copy code |
"; }while ($i |
Loop related statements-break
Basic concept: Indicates the end of the current for, while, do..while, switch, process. You can give a number to indicate which layer to exit to.
1. The break statement will jump out to level 1 by default
2. The number after the break statement cannot exceed the actual number of loop levels that can be jumped out, otherwise, a fatal error will be reported
Loop-related statements-continue
Basic concept: continue is used to end the remaining code of this loop and start a new loop from scratch (if the condition is true, continue execution), continue can also be followed by a number to indicate the number of loops to restart from
goto statement
Basic concept: Through the goto statement, we can jump the program to a specified place for execution.
goto tag;
Tag:
Statement;
Quick Start Case:
The code is as follows
|
Copy code
|
||||
goto a; echo 'aa'; a: echo 'bb';
Constant in php Description: The so-called constants, we can understand that achievements are special variables: reflected in 1. You don’t need $ before defining a constant 2. Once a constant is defined, its value cannot be modified
| 3. When a constant is defined, it needs to be assigned an initial value.
5. The name of the constant, we generally say it is all capital letters, and then separated by underscores

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