[lang-ref] ( get_command_standard_error ) ( php )

<?php
public function testGetCommandStandardError(): void
{
	// proc_open() ..

	$descriptorspec = [
		0 => ['pipe', 'r'], // stdin
		1 => ['pipe', 'w'], // stdout
		2 => ['pipe', 'w'], // stderr
	];

	$process = proc_open(
		'ls -l /no/such/file',
		$descriptorspec,
		$pipes
	);

	if (!is_resource($process)) {
		throw new RuntimeException('Failed to start process.');
	}

	fclose($pipes[0]);

	$stdout = stream_get_contents($pipes[1]);
	$stderr = stream_get_contents($pipes[2]);

	fclose($pipes[1]);
	fclose($pipes[2]);

	$status = proc_close($process);

	$this->assertStringContainsString('no such file', strtolower($stderr));

	$this->assertSame('', $stdout);
	$this->assertSame(1, $status);
}

<?php
public function testGetCommandStandardErrorAlternative(): void
{
	// shell_exec('.... >2>&1')

	$out = shell_exec('ls -l /no/such/file 2>&1'); // this is not what I want
	$out = rtrim($out, "\r\n");

	$this->assertStringContainsString('no such file', strtolower($out));
}