如果版本大于1.5.1.3，则进行Opencart测试

How would I add an IF statement to check if the opencart version is greater than 1.5.1.3?

This is defined in the index.php as:

// Version
define('VERSION', '1.5.0');

I have tried: if((int)VERSION >= '1.5.1.3'){ although when I convert this into an int it becomes empty.

Also I tried this with the same effect:

$this->data['oc_version'] = (int)str_replace('.', '', VERSION);
if($this->data['oc_version'] >= 1513){

Do I need to convert this into an int to correctly perform greater/less than calculations?

if(version_compare(VERSION, '1.5.1.3', '>')) {
    // CODE HERE IF HIGHER
} else {
    // CODE HERE IF LOWER
}

Though the 1.5.1.3 branch actually goes up to 1.5.1.3.1 so I'm guessing you want it to be that

I tried this recently and couldnt get it working as above, perhaps its a PHP version thing but I got it working with:

if(version_compare(VERSION, '1.5.1.3') > 0) {
    // CODE HERE IF HIGHER
} else {
    // CODE HERE IF LOWER
}