Inkscape inside PHP/Apache doesn't render fonts to PNG
As was determined in the comments above, this was caused by an environmental difference - the HOME env var was set differently inside the executed process. Using proc_open instead of simple exec gave more precise control over said process and explicitly setting that env var solved the issue.
For the record, here's the usage of proc_open that helped fix this issue:
$command = "{$exec} --without-gui {$params} {$file} {$redirect}";$return = -1;// Comment this out for now//exec($command, self::$output, $return);$descriptorspec = array( 0 => array("pipe", "r"), 1 => array("pipe", "w"), 2 => array("file", "/dev/null", "a"));$pipes = array();$env = array( // Try additional stuff here, but culprit was: 'HOME' => '/Users/jon',);$resource = proc_open( $command, $descriptorspec, $pipes, $cwd = null, $env);