PHP if else Statement


title: If-else Statement

Introduction

If/Else is a conditional statement where depending on the truthiness of a condition, different actions will be performed.

Note: The {} brackets are only needed if the condition has more than one action statement; however, it is best practice to include them regardless.

If Statement

<?php if (condition) { statement1; statement2; }

Note: You can nest as many statements in an “if” block as you’d like; you are not limited to the amount in the examples.

If/Else Statement

<?php if (condition) { statement1; statement2; } else { statement3; statement4; }

Note: The else statement is optional.

If/Elseif/Else Statement

<?php if (condition1) { statement1; statement2; } elseif (condition2) { statement3; statement4; } else { statement5; }

Note: elseif should always be written as one word.

Nested If/Else Statement

<?php if (condition1) { if (condition2) { statement1; statement2; } else { statement3; statement4; } } else { if (condition3) { statement5; statement6; } else { statement7; statement8; } }

Multiple Conditions

Multiple conditions can be used at once with the “or” (||), “xor”, and “and” (&&) logical operators.

For instance:

<?php if (condition1 && condition2) { echo 'Both conditions are true!'; } elseif (condition 1 || condition2) { echo 'One condition is true!'; } else (condition1 xor condition2) { echo 'One condition is true, and one condition is false!'; }

Note: It’s a good practice to wrap individual conditions in parens when you have more than one (it can improve readability).

Ternary Operators

Another important option to consider when using short If/Else statements is the ternary operator.

$statement=(condition1 ? "condition1 is true" : "condition1 is false");

Alternative If/Else Syntax

There is also an alternative syntax for control structures

if (condition1): statement1; else: statement5; endif;

More Information:

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