User-modified variables:
- string $OFS - Output Field Separator (default: ) [AWK compatible]
- string $ORS - Output Record Separator (default: PHP_EOL) [AWK compatible]
Auto-set variables:
- int $NR - The number of input records [AWK compatible]
- int $FNR - The current record number in the current file [AWK compatible]
- string $F0 - Contains current line
- string[] $F - Contains fields separated by $OFS [AWK compatible]
- int $NF - The number of fields in $F [AWK compatible]
- int $argi - Same as $NR [PHP compatible]
- string $argn - Same as $F0 [PHP compatible]