# Logical Operators

Some of these will be useful now. Some will be used later when I start explaining control structures such as if statements, however here are the operators available to you in PHP

```\$a += \$b same as \$a = \$a + \$b // plus \$a -= \$b same as \$a = \$a - \$b // minus \$a *= \$b same as \$a = \$a * \$b // multiply \$a /= \$b same as \$a = \$a / \$b // divide \$a .= \$b same as \$a = \$a . \$b // concatenate (for use in strings) \$a++ same as \$a = \$a + 1 \$a-- same as \$a = \$a - 1 \$a == \$b // comparison operator, used in if statements etc. \$a = \$b // assignment operator, ie. \$a becomes the value of \$b - don't get this and the comparison operator mixed up! \$a != \$b // not equal to \$a < \$b // \$a is less than \$b \$a <= \$b // \$a is less than or equal to \$b \$a > \$b // \$a is greater than \$b \$a >= \$b // \$a is great than or equal to \$b !\$a // NOT operator, returns true if \$a is false \$a && \$b // AND operator, returns true if both are true \$a || \$b // OR operator, returns true if either are true \$a AND \$b // same as AND operator \$a OR \$b // same as OR operator```