array_map not working in classes

array_map($this->dash(), $data) calls $this->dash() with 0 arguments and uses the return value as the callback function to apply to each member of the array. You want array_map(array($this,'dash'), $data) instead.

It must read

$this->classarray = array_map(array($this, 'dash'), $data);

The array-thing is the PHP callback for a object instance method. Callbacks to regular functions are defined as simple strings containing the function name ('functionName'), while static method calls are defined as array('ClassName, 'methodName') or as a string like that: 'ClassName::methodName' (this works as of PHP 5.2.3).

You are specifying dash as the callback in the wrong way.

This does not work:

$this->classarray = array_map($this->dash(), $data);

This does:

$this->classarray = array_map(array($this, 'dash'), $data);

Read about the different forms a callback may take here.

Hello You can use Like this one

    // Static outside of class context
array_map( array( 'ClassName', 'methodName' ), $array );

// Static inside class context
array_map( array( __CLASS__, 'methodName' ), $array );

// Non-static outside of object context
array_map( array( $object, 'methodName' ), $array );

// Non-static inside of object context
array_map( array( $this, 'methodName' ), $array );