PHP if Operators

Veröffentlicht 2024-05-17 07:45:46

5KB

Comparison Operators

If statements usually contain conditions that compare two values.

Check if $t is equal to 14:

$t = 14;

if ($t == 14) {
  echo "Have a good day!";
}

To compare two values, we need to use a comparison operator.

Here are the PHP comparison operators to use in if statements:

Operator	Name	Result	Try it
==	Equal	Returns true if the values are equal	Try it »
===	Identical	Returns true if the values and data types are identical	Try it »
!=	Not equal	Returns true if the values are not equal	Try it »
<>	Not equal	Returns true if the values are not equal	Try it »
!==	Not identical	Returns true if the values or data types are not identical	Try it »
>	Greater than	Returns true if the first value is greater than the second value	Try it »
<	Less than	Returns true if the first value is less than the second value	Try it »
>=	Greater than or equal to	Returns true if the first value is greater than, or equal to, the second value	Try it »
<=	Less than or equal to	Returns true if the first value is less than, or equal to, the second value	Try it »

To check more than one condition, we can use logical operators, like the && operator:

Check if $a is greater than $b, AND if $a is less than $c:

$a = 200;
$b = 33;
$c = 500;

if ($a > $b && $a < $c ) {
  echo "Both conditions are true";
}

Here are the PHP logical operators to use in if statements:

Operator	Name	Description	Try it
and	And	True if both conditions are true	Try it »
&&	And	True if both conditions are true	Try it »
or	Or	True if either condition is true	Try it »
\|\|	Or	True if either condition is true	Try it »
xor	Xor	True if either condition is true, but not both	Try it »
!	Not	True if condition is not true	Try it »

We can compare as many conditions as we like in one if statement:

Check if $a is either 2, 3, 4, 5, 6, or 7:

$a = 5;

if ($a == 2 || $a == 3 || $a == 4 || $a == 5 || $a == 6 || $a == 7) {
  echo "$a is a number between 2 and 7";
}

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