如果存在name.jpg的文件，请执行A else

Question

I need to develop a little PHP script that I can run from a cron job which in pseudo code does the following:

//THIS IS PSEUDO CODE
If(file exists with name 'day.jpg')
    rename it to 'fixtures.jpg'
else
    copy 'master.jpg' to 'fixtures.jpg'

Where day.jpg should be the current day of the month.

I started to replace the pseudo code with the stuff I'm pretty sure how to do:

<?php

    if(FILE EXISTS WITH NAME DAY.JPG) {
        rename ("DAY.JPG", "fixtures.jpg");
    } else {
        copy ("master.jpg", "fixtures.jpg");
    }

?>

Clearly there are still a few things missing. Like I need to get the filename with the current day of the month and I need to check if the file exists or not.

I guess I need to do something like this $filename='date('j');'.jpg to get the filename, but it isn't really working so I kinda need a bit help there. Also I don't really know how to check if a file exists or not?

Answer 1

You have a basic syntax problem, it should be:

$filename = date('j') . '.jpg';

You don't put function calls inside quotes, you need quotes around the literal string '.jpg', and you need to use . to concatenate them.

I recommend you read the chapter on Strings in a PHP tutorial.