how to add variable in array element in php? -


code:

public $img_config = array('thum_img' => array(         'image_ratio_crop' => true,         'image_resize' => true,         'image_x' => 175,         'image_y' => 240     ),     'small_img' => array(         'image_ratio_crop' => true,         'image_resize' => true,         'image_x' => 110,         'image_y' => 35     ),     'parent_dir' => 'productimages',     'target_path' => array(         'thum_img' => www_root . 'productimages' . ds . 'thum' . ds,         'small_img' => www_root . 'productimages' . ds . 'small' . ds     ) ); 

this not work. www_root . 'productimages' . ds . 'thum' . ds, , www_root . 'productimages' . ds . 'small' . ds reason of error. doing wrong?

http://docs.php.net/language.oop5.properties says:

properties

[...]

they defined using 1 of keywords public, protected, or private, followed normal variable declaration. declaration may include initialization, but initialization must constant value--that is, must able evaluated @ compile time , must not depend on run-time information in order evaluated.

constant scalar expressions added in php 5.6.0.
therefore

<?php define('a_constant', '123'); class foo {     public $bar = 'abc'.a_constant; } 

works in php 5.6+ not before.


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