PHP Using code as a function, variables not working

Question

I've got this code which works well standalone:

file_put_contents('dataFile', implode('', 
    array_map(function($data) {
    return stristr($data,"NSQ = ") ? "NSQ = school\n" : $data;
    }, file('dateFile'))
));

This reads dataFile and finds the entry NSQ = and updates it to be NSQ = school

I'm going to reuse this multple times so changed it into a function:

function updatesite($site) {
file_put_contents('dataFile', implode('', 
    array_map(function($data) {
    return stristr($data,"$site = ") ? "$site = school\n" : $data;
    }, file('dateFile'))
));
}

Initially, I got an error that $site didn't exist, so I added global $site; before the return.

That stopped the error, but it doesn't update the file.

Is there any way I can use a variable like this?

Marco · Accepted Answer · 2020-05-29 12:04:15Z

5

You can use use to pass variables to a function callback like this:

function updatesite($site) {
    file_put_contents('dataFile', implode('', 
        array_map(function($data) use ($site) {
            return stristr($data,"$site = ") ? "$site = school\n" : $data;
        }, file('dateFile'))
    ));
}

answered May 29, 2020 at 12:04

Marco

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