Numeric Comparisons

Use == to Compare Two Numbers for Equality

$a = 4 == 4; # TRUE $a = 4 == 2 + 2; # TRUE $a = 4 == $b; # depends on what $b is

Do not confuse == with =

== is for numeric comparison.

= is for assignment.

Use != to Compare Two numbers for Non-Equality

$a = 4 != 4; # FALSE $a = 4 != 2 + 2; # FALSE $a = 4 != $b; # depends on what $b is

Use > and < for "Greater than", "Less than"

$a = 4 > 3; # TRUE $a = 4 < 3; # FALSE $a = 4 > $b; # depends on what $b is

Use >= and <= for "Greater than or Equal", "Less than or Equal"

$a =  4 >= 3;      # TRUE
$a =  4 >= 4;      # TRUE
$a =  4 <= $b;     # depends on what $b is

Use <=> to Compare Two Numbers

$result = $a <=> $b

$result is

• -1 if the left side is less than the right side
• 0 if the left side equals the right side
• +1 if the left side is greater than the right side

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