declare is used to set an execution directive for a block of code.

The following directives are recognized:

• [ticks](<http://php.net/manual/en/control-structures.declare.php#control-structures.declare.ticks>)
• [encoding](<http://php.net/manual/en/control-structures.declare.php#control-structures.declare.encoding>)
• [strict_types](<http://php.net/manual/en/functions.arguments.php#functions.arguments.type-declaration.strict>)

For instance, set ticks to 1:

declare(ticks=1);

To enable strict type mode, the declare statement is used with the strict_types declaration:

declare(strict_types=1);