Hướng dẫn multiple if statements php
For efficiency, you're best to use a switch statement, and then to catch those you have not found in your cases, you can use a default.
Edit: I decided to return to this at a later date, to better explain why this is better.
An if else combination implies an order. E.g.
With this, it means it will check the first condition, if thing == thing1, if not, check if it equals the next condition which is thing == thing2 and so on. If you're generally always expecting thing1, then this might be okay, because you're just catching a few other things. However, realistically it's inefficient to check all possible conditions before you reach the solution you need.
Instead, by writing the equivalent switch statement:
What this does instead, is grab the answer first, e.g. thing == "thing3", and then it'll skip the other cases that are irrelevant, and instead only do what it needs to do. It does not use an order, instead it works a bit like pointing to the correct answer. So it doesn't matter if your actual answer is the first case, or the hundredth, it only does what is relevant.
So to summarise: If you use a switch, and your answered case is the hundredth case, it'll point to what to do after that switch(answer) is found, if you were to use ifelse and your answer was the 100th variation of the ifelse, it would have to iterate through 99 other pointless checks before doing what it needs to do.
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If statement is used to execute when a statement or a block of statement only if the condition is fulfilled or true.
For One Statement:-
For more than one Statement:-
Nested if Statement
We can make nesting statement by nesting the if statement. It means when we insert a second if statement inside an if statement, we call it nested if statement or nesting the if statement.
To know more about If Statement and Nested if Statement Click here – If Statement and Nested if Statement
if else and Nested if else Statement.
A statement executes code if if_condition is true and executes another code if if_condition is false.
Example – when Condition is True then, if_condition executes. See Below
when Condition is False then, else_condition executes. See Below
Nested if else Statement
we insert a second if_else statement inside an if_else statement, we call it nested _if_else statement.
In the above program, The first Condition is true, then it enters in 2nd condition to check and when the 2nd condition is true then it prints that statement and skips other else statements. See the Output below:
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PHP Fundamental Tutorials with Basic Demo by Chentan in 2020 – Part-1
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What is nested if else statement?
A nested if statement is an if statement placed inside another if statement. Nested if statements are often used when you must test a combination of conditions before deciding on the proper action.
What is nested IF explain with example?
A nested if statement is an if-else statement with another if statement as the if body or the else body. Here's an example: if ( num > 0 ) // Outer if if ( num < 10 ) // Inner if System. out.
What is difference between if and nested IF?
The nested if is an if statement used within another if statement. When we use if else if then an if statement is used within the else part of another if in this way,'nested if is similar to an if else if statement.
What is the difference between Elseif and else if in PHP?
In PHP, you can also write 'else if' (in two words) and the behavior would be identical to the one of 'elseif' (in a single word). The syntactic meaning is slightly different (if you're familiar with C, this is the same behavior) but the bottom line is that both would result in exactly the same behavior.