   #PHP Manual Operators Bitwise Operators Error Control Operators

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Comparison Operators

   Comparison operators, as their name implies, allow you to compare two
   values. You may also be interested in viewing the type comparison
   tables, as they show examples of various type related comparisons.

   Table 10-4. Comparison Operators
   Example Name Result
   $a == $b Equal TRUE if $a is equal to $b.
   $a === $b Identical TRUE if $a is equal to $b, and they are of the
   same type. (PHP 4 only)
   $a != $b Not equal TRUE if $a is not equal to $b.
   $a <> $b Not equal TRUE if $a is not equal to $b.
   $a !== $b Not identical TRUE if $a is not equal to $b, or they are not
   of the same type. (PHP 4 only)
   $a < $b Less than TRUE if $a is strictly less than $b.
   $a > $b Greater than TRUE if $a is strictly greater than $b.
   $a <= $b Less than or equal to TRUE if $a is less than or equal to $b.
   $a >= $b Greater than or equal to TRUE if $a is greater than or equal
   to $b.

   Another conditional operator is the "?:" (or ternary) operator, which
   operates as in C and many other languages.

   <?php
   // Example usage for: Ternary Operator
   $action = (empty($_POST['action'])) ? 'default' : $_POST['action'];
   // The above is identical to this if/else statement
   if (empty($_POST['action'])) {
       $action = 'default';
   } else {
       $action = $_POST['action'];
   }
   ?>

   The expression (expr1) ? (expr2) : (expr3) evaluates to expr2 if expr1
   evaluates to TRUE, and expr3 if expr1 evaluates to FALSE.

   See also strcasecmp(), strcmp(), and the manual section on Types.
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