Smarty Manual
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# Modifiers

Modifiers are little functions that are applied to a variable in the template before it is displayed or used in some other context. Modifiers can be chained together.

``mixed smarty_modifier_`name`` (mixed $value, [mixed $param1, ...])`

The first parameter to the modifier plugin is the value on which the modifier is to operate. The rest of the parameters are optional, depending on what kind of operation is to be performed.

The modifier has to return the result of its processing.

Example 16-3. A simple modifier plugin This plugin basically aliases one of the built-in PHP functions. It does not have any additional parameters.
`<?php /* * Smarty plugin * ------------------------------------------------------------- * File: modifier.capitalize.php * Type: modifier * Name: capitalize * Purpose: capitalize words in the string * ------------------------------------------------------------- */ function smarty_modifier_capitalize($string) { return ucwords($string); } ?>`

Example 16-4. More complex modifier plugin
`<?php /* * Smarty plugin * ------------------------------------------------------------- * File: modifier.truncate.php * Type: modifier * Name: truncate * Purpose: Truncate a string to a certain length if necessary, * optionally splitting in the middle of a word, and * appending the $etc string. * ------------------------------------------------------------- */ function smarty_modifier_truncate($string, $length = 80, $etc = '...', $break_words = false) { if ($length == 0) return ''; if (strlen($string) > $length) { $length -= strlen($etc); $fragment = substr($string, 0, $length+1); if ($break_words) $fragment = substr($fragment, 0, -1); else $fragment = preg_replace('/\s+(\S+)?$/', '', $fragment); return $fragment.$etc; } else return $string; } ?>`

See also `register_modifier()`, `unregister_modifier()`.

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