read through a 2 column csv. if a the first column value matches a key in the replacements dictionary, replace column 2 with the key value. just some boring throw away code that I feel like I'm always rewriting.

csv_find_n_replace

public function rewrite(){
	$replacements = <<<EOD
{
	"apple" : "fruit",
	"tomato" : "fruit",
	"kale" : "vegetable"
}
EOD;

	$replacements = json_decode($replacements, true);
		
	$in = @fopen(dirname(__FILE__) . '/food-in.csv', 'r');
	$out = @fopen(dirname(__FILE__) . '/food-out.csv', 'w');
	while (!feof($in))
	{
		$line = fgets($in);
		$parts = explode(',', $line);
		if(array_key_exists($parts[0], $replacements)){
			fputs($out, $parts[0] . ',' . $replacements[$parts[0]] . "\n");
		} else {
			fputs($out, $line);
		}
	}
			
}