- var_dump: documentation ( source)
- preg_replace: documentation ( source)
<?php
$apiResultJSON = 'asdfasdfasdfasdf -sharpen 5x1 asdfasdfasdfasdfimages295472source1879420.jpg asdfasdf -sharpen 0x0 ';
$apiResultJSON = preg_replace('\-sharpen [0-9]x[0-9]', "", $apiResultJSON);
var_dump($apiResultJSON);