Symfony Command that read file from file name or STDIN

MyCommand.php

<?php

namespace AmceBundle\Command;

class MyCommand
{
    // ...
    
    protected function execute(InputInterface $input, OutputInterface $output)
    {
        if ($filename = $input->getArgument('filename')) {
            $contents = file_get_contents($filename);
        } else if (0 === ftell(STDIN)) {
            $contents = '';
            while (!feof(STDIN)) {
                $contents .= fread(STDIN, 1024);
            }
        } else {
            throw new \RuntimeException("Please provide a filename or pipe template content to STDIN.");
        }
        
        // Do whatever you want with `$contents`
    }
}

This line should be removed:

- $filename = $input->getArgument('filename');

Thanks for sharing this.

Or use stream_get_contents

@chalasr removed 😉

I found that the strategy of using ftell() to identify if there was content to get from STDIN was problematic when running PHPUnit via PHPStorm because ftell() always returned 0. I'm not sure what PHPStorm is doing with STDIN for this to happen.

So I found the following alternative strategy from PHP - detect STDIO input - Stack Overflow by dedee which appears to work in all cases.

$readStreams = [STDIN];
$writeStreams = [];
$exceptStreams = [];
$streamCount = stream_select($readStreams, $writeStreams, $exceptStreams, 0);

$hasStdIn = $streamCount === 1;

if ($hasStdIn) {
    // Read content from STDIN ...
}