<?php
$variableName = 'MyVariable';
$variableName .= '900';
// Create new variable with the name defined in variable $variableName
${$variableName900} = 'MyValue';
//Outputs: string(7) "MyValue"
var_dump($MyVariable);
//Outputs: string(7) "MyValue"
var_dump(${'MyVariable'});
Warning: Undefined variable $variableName900 in /in/ZqcsD on line 5
Warning: Undefined variable $MyVariable in /in/ZqcsD on line 8
NULL
Warning: Undefined variable $MyVariable in /in/ZqcsD on line 10
NULL
Notice: Undefined variable: variableName900 in /in/ZqcsD on line 5
Notice: Undefined variable: MyVariable in /in/ZqcsD on line 8
NULL
Notice: Undefined variable: MyVariable in /in/ZqcsD on line 10
NULL
Notice: Undefined variable: variableName900 in /in/ZqcsD on line 5
Notice: Undefined variable: MyVariable in /in/ZqcsD on line 8
NULL
Notice: Undefined variable: MyVariable in /in/ZqcsD on line 10
NULL