Php branch structure condition structure selection structure-PHP source code

Ec (2); php tutorial branch structure condition structure selection Structure & lt ;? Php * & nbsp; Process Control & nbsp; * & nbsp; & nbsp; 1. Sequence Structure & nbsp; * & nbsp; 2. Branch Structure -- condition Structure -- select Structure & nbsp; * script ec (2); script

Php tutorial branch structure condition structure selection Structure

/*
* Process Control
*
* 1. Ordered Structure
* 2. Branch Structure-condition structure-select Structure
* 1. Single Branch
* // Condition bool, true or false, ><==! -& |!
* If (condition)
* Execute the following statement.
* If (condition)
*{
* Code segment;
* Code segment;
*}
*
* 2. Dual Branch
* Use else clause
*
* If (condition)
* Execute a statement
* Else
* Execute a statement
* If (condition ){
* One or more codes
*} Else {
* One or more codes
*}
*
* 3. Multiple branches
* If else if and switch case can be used
* // This is a mutually exclusive relationship.
* If (condition ){
*
*} Else if (condition ){
*} Else if (condition ){
*} Else {
*}
* 4. nested branches
* If (){
* If (){
*} Else {
* If (){}
*}
*}
* 3. Loop Structure
*
*
*
*
*
* Conclusion:
* Elseif is used to determine a range
* For a single match, use switch case
*/
// Single-path execution
$ A = 10;
$ B = 5;
If ($ a> $ B)
Echo "$ a is greater than $ B ";

// Two-way execution
$ A = 10;
$ B = 20;
If ($ a> $ B)
{
Echo "$ a greater than $ B
";
}
Else
{
Echo "$ a less than $ B
";
}

// Multi-path execution
$ Hour = date ("H ");
If ($ hour> 6 & $ hour <9)
{
Echo "good morning! ":
}
Else if ($ hour> 9 & $ hour <12)
{
Echo "good morning ";
}
Else if ($ hour> 12 & $ hour <14)
{
Echo "Good noon ";
}
Else if ($ hour> 14 & $ hour <17)
{
Echo "Good afternoon ";
}
Else if ($ hour> 17 & $ hour <19)
{
Echo "Good evening ";
}
Else if ($ hour> 19 & $ hour <22)
{
Echo "Good evening ";
}
Else
{
Echo "good night ";
}
// Code improvement based on mutual exclusion
$ Hour = date ("H ");
If ($ hour <9)
{
Echo "good morning! ":
}
Else if ($ hour <12)
{
Echo "good morning ";
}
Else if ($ hour <14)
{
Echo case "Mon ":
Echo "Monday ";
Break; "Good noon ";
}
Else if ($ hour <17)
{
Echo "Good afternoon ";
}
Else if ($ hour> 19)
{
Echo "Good evening ";
}
Else if ($ hour <22)
{
Echo "Good evening ";
}
Else
{
Echo "good night ";
}

// Determine the day of the week
$ Week = date ("D"); // obtain the day of the week
Switch ($ week) // switch (variable) variables only use integer and string
{
Case "Mon ":
Echo "Monday ";
Break;
Case "Tue"
Echo "Tuesday ";
Break;
Case "Wed ":
Echo "Wednesday ";
Break;
Case "Thu ":
Echo "Thursday ";
Break;
Case "Fri ":
Echo "Friday ";
Break;
Default:
Echo "Weekend ";
}

// Nested class
$ Sex = $ _ GET ["sex"];
$ Age = $ _ GET ["age"];
If ($ sex = "nan ")
{
If ($ age> = 60)
{
Echo "this $ sex has retired". ($ age-60). "years ";
}
Else
{
Echo "this man is still at work, and". (60-$ age). "retired only in years ";
}
}
Else
{
If ($ age> = 66)
{
Echo "this $ sex has retired". ($ age-66). "years ";
}
Else
{
Echo "this lady is still working, and". (66-$ age). "She retired in just one year ";
}
}
?>