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Add and subtract

Measurements can be added together using add() and subtracted using sub(). The result will use the same type as the originating object. Dynamic objects support a fluid style of programming, where complex sequences of operations can be nested without risk of side-effects altering the input objects.

Example 615. Adding units

<?php
// Define objects
$unit = new Zend_Measure_Length(200Zend_Measure_Length::CENTIMETER);
$unit2 = new Zend_Measure_Length(1Zend_Measure_Length::METER);

// Add $unit2 to $unit
$sum $unit->add($unit2);

echo 
$sum// outputs "300 cm"


Automatic conversion

Adding one object to another will automatically convert it to the correct unit. It is not necessary to call convertTo() before adding different units.

Example 616. Subtract

Subtraction of measurements works just like addition.

<?php
// Define objects
$unit = new Zend_Measure_Length(200Zend_Measure_Length::CENTIMETER);
$unit2 = new Zend_Measure_Length(1Zend_Measure_Length::METER);

// Subtract $unit2 from $unit
$sum $unit->sub($unit2);

echo 
$sum;


Zend Framework