Original PHP Tutorial: Process control

Switchcase // suitable for matching a single value. this is a mutex. original PHP Tutorial: process control.

Multiple branches

If else if // suitable for range matching

Switch case // suitable for matching a single value. this is a mutually exclusive relationship.

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Syntax

If (condition ){

} Elseif (condition ){

} Elseif (condition ){

} Else if (condition ){

} Else {

}

Switch (variable ){

Case value:

Code;

Break;

Case value 1:

Code;

Break;

Default:

Code;

}

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Instance 1 // understand the mutex feature of multi-branch statements

$ Hour = date ("H ");

If ($ hour <6 ){

Echo "good morning ";

} Elseif ($ hour <9 ){

Echo "good morning ";

} Elseif ($ hour <12 ){

Echo "good morning ";

} Elseif ($ hour <14 ){

Echo "Good Noon ";

} Elseif ($ hour <17 ){

Echo "good afternoon ";

} Elseif ($ hour <19 ){

Echo "good evening ";

} Elseif ($ hour <22 ){

Echo "good evening ";

} Else {

Echo "good night ";

}

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Instance 2 // Determine the day of the week

$ Week = date ("D ");

Switch ($ week) {// swinch (variable) variables only use integer and string

Case "Mon ":

Echo "Monday ";

Break; // The break is used to exit the switch.

Case "Tue ":

Echo "Tuesday ";

Break;

Case "Wed ":

Echo "Wednesday ";

Break;

Case "Thu ":

Echo "Thursday ";

Break;

Case "Fri ":

Echo "Friday ";

Break;

Default: // if the variable does not have a matching value, execute the region in default. you can add

Echo "weekend ";

}

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Instance 3 // to better understand the break in the switch, it is used to set multiple values to match and execute the same code

$ Week = "Thursday ";

Switch ($ week ){

Case "Mon ":

Echo "Monday ";

Case "Tue ":

Echo "Tuesday ";

Case "Wed ":

Echo "Wednesday ";

Case "Thu ":

Echo "Thursday ";

Case "Fri ":

Echo "Friday ";

Default:

Echo "weekend ";

}

Final result: Thursday and Friday weekends

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Nested branch instance: // you can pass the http: // localhost/code1/10.php? parameter in this way? Sex = man & age = 15

$ Sex = $ _ GET ["sex"];

$ Age = $ _ GET ["age"];

If ($ sex = "nan "){

If ($ age> = 60 ){

Echo "this man has retired". ($ age-60). "years ";

} Else {

Echo "this man is still at work, and". (60-$ age). "He retired only in years.
";

}

} Else {

If ($ age> = 66 ){

Echo "this lady has retired". ($ age-55). "years ";

} Else {

Echo "this lady is still at work, and". (55-$ age). "she retired in years.
";

}

}