reverse-complement PHP program

<?php
#
# The Computer Language Benchmarks Game
# https://salsa.debian.org/benchmarksgame-team/benchmarksgame/
#
# reverse complement in PHP
# contributed by Danny Sauer
#

# We'll need some definitions
define( 'LINE_LENGTH', 60 );
define( 'SRC', 'CGATMKRYVBHD');
define( 'DST', 'GCTAKMYRBVDH');
$str = '';
$seq = '';

# read in the file, a line at a time
while( !feof(STDIN) ) {
    $str = trim(fgets(STDIN));
    if( $str[0] == '>' ){
        # if we're on a comment line, print the previous seq and move on
        print_seq();
        echo $str, "\n";
    }else{
        # otherwise, just append to the sequence
        $seq .= $str;
    }
}
print_seq();

exit;

# print the sequence out, if it exists
function print_seq(){
    global $seq; # no time-consuming argument passing for us! :)
    if($seq != ''){
        echo wordwrap( strrev( strtr(strtoupper($seq), SRC, DST) ),
                       LINE_LENGTH, "\n", true ), "\n";
    }
    $seq = '';
}
?>
    

NOTES:
64-bit Ubuntu quad core
PHP 7.4.5 (cli) (built: May 11 2020 13:25:48) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies


Mon, 11 May 2020 22:31:03 GMT

COMMAND LINE:
/opt/src/php-7.4.5/bin/php -n -d memory_limit=3072M revcomp.php 0 < revcomp-input100000000.txt

(TRUNCATED) PROGRAM OUTPUT:
>ONE Homo sapiens alu
GGGATTACAGGCGTGAGCCACCGCGCCCGGCCTTTTTGAGACGGAGTCTCGCTCTGTCGC
CCAGGCTGGAGTGCAGTGGCGCGATCTCGGCTCACTGCAACCTCCGCCTCCCGGGTTCAA
GCGATTCTCCTGCCTCAGCCTCCCGAGTAGCTGGGATTACAGGCGCGCGCCACCACGCCC
GGCTAATTTTTGTATTTTTAGTAGAGACGGGGTTTCACCATGTTGGCCAGGCTGGTCTCG
AACTCCTGACCTCAGGTGATCCGCCCGCCTCGGCCTCCCAAAGTGCTGGGATTACAGGCG
TGAGCCACCGCGCCCGGCCTTTTTGAGACGGAGTCTCGCTCTGTCGCCCAGGCTGGAGTG
CAGTGGCGCGATCTCGGCTCACTGCAACCTCCGCCTCCCGGGTTCAAGCGATTCTCCTGC
CTCAGCCTCCCGAGTAGCTGGGATTACAGGCGCGCGCCACCACGCCCGGCTAATTTTTGT
ATTTTTAGTAGAGACGGGGTTTCACCATGTTGGCCAGGCTGGTCTCGAACTCCTGACCTC
AGGTGATCCGCCCGCCTCGGCCTCCCAAAGTGCTGGGATTACAGGCGTGAGCCACCGCGC
CCGGCCTTTTTGAGACGGAGTCTCGCTCTGTCGCCCAGGCTGGAGTGCAGTGGCGCGATC
TCGGCTCACTGCAACCTCCGCCTCCCGGGTTCAAGCGATTCTCCTGCCTCAGCCTCCCGA
GTAGCTGGGATTACAGGCGCGCGCCACCACGCCCGGCTAATTTTTGTATTTTTAGTAGAG
ACGGGGTTTCACCATGTTGGCCAGGCTGGTCTCGAACTCCTGACCTCAGGTGATCCGCCC
GCCTCGGCCTCCCAAAGTGCTGGGATTACAGGCGTGAGCCACCGCGCCCGGCCTTTTTGA
GACGGAGTCTCGCTCTGTCGCCCAGGCTGGAGTGCAGTGGCGCGATCTCGGCTCACTGCA
ACCTCCGCCTCCCGGGTTCAAGCGATTCTCCTGCCTCAGCCTCCCGAGTAGCTGGGATTA
CAGGCGCGCGCCACCACGCCCGGCTAATTTTTGTATTTTTAGTAGAGACGGGGTTTCACC
ATGTTGGCCAGGCTGGTCTCGAACTCCTGACCTCAGGTGATCCGCCCGCCTCGGCCTCCC
AAAGTGCTGGGATTACAGGCGTGAGCCACCGCGCCCGGCCTTTTTGAGACGGAGTCTCGC
TCTGTCGCCCAGGCTGGAGTGCAGTGGCGCGATCTCGGCTCACTGCAACCTCCGCCTCCC
GGGTTCAAGCGATTCTCCTGCCTCAGCCTCCCGAGTAGCTGGGATTACAGGCGCGCGCCA
CCACGCCCGGCTAATTTTTGTATTTTTAGTAGAGACGGGGTTTCACCATGTTGGCCAGGC
TGGTCTCGAACTCCTGACCTCAGGTGATCCGCCCGCCTCGGCCTCCCAAAGTGCTGGGAT
TACAGGCGTGAGCCACCGCGCCCGGCCTTTTTGAGACGGAGTCTCGCTCTGTCGCCCAGG
CTGGAGTGCAGTGGCGCGATCTCGGCTCACTGCAACCTCCGCCTCCCGGGTTCAAGCGAT
TCTCCTGCCTCAGCCTCCCGAGTAGCTGGGATTACAGGCGCGCGCCACCACGCCCGGCTA
ATTTTTGTATTTTTAGTAGAGACGGGGTTTCACCATGTTGGCCAGGCTGGTCTCGAACTC
CTGACCTCAGGTGATCCGCCCGCCTCGGCCTCCCAAAGTGCTGGGATTACAGGCGTGAGC
CACCGCGCCCGGCCTTTTTGAGACGGAGTCTCGCTCTGTCGCCCAGGCTGGAGTGCAGTG
GCGCGATCTCGGCTCACTGCAACCTCCGCCTCCCGGGTTCAAGCGATTCTCCTGCCTCAG
CCTCCCGAGTAGCTGGGATTACAGGCGCGCGCCACCACGCCCGGCTAATTTTTGTATTTT
TAGTAGAGACGGGGTTTCACCATGTTGGCCAGGCTGGTCTCGAACTCCTGACCTCAGGTG
ATCCGCCCGCCTCGGCCTCCCAAAGTGCTGGGATTACAGGCGTGAGCCACCGCGCCCGGC
CTTTTTGAGACGGAGTCTCGCTCTGTCGCCCAGGCTGGAGTGCAGTGGCGCGATCTCGGC
TCACTGCAACCTCCGCCTCCCGGGTTCAAGCGATTCTCCTGCCTCAGCCTCCCGAGTAGC
TGGGATTACAGGCGCGCGCCACCACGCCCGGCTAATTTTTGTATTTTTAGTAGAGACGGG
GTTTCACCATGTTGGCCAGGCTGGTCTCGAACTCCTGACCTCAGGTGATCCGCCCGCCTC
GGCCTCCCAAAGTGCTGGGATTACAGGCGTGAGCCACCGCGCCCGGCCTTTTTGAGACGG
AGTCTCGCTCTGTCGCCCAGGCTGGAGTGCAGTGGCGCGATCTCGGCTCACTGCAACCTC
CGCCTCCCGGGTTCAAGCGATTCTCCTGCCTCAGCCTCCCGAGTAGCTGGGATTACAGGC
GCGCGCCACCACGCCCGGCTAATTTTTGTATTTTTAGTAGAGACGGGGTTTCACCATGTT
GGCCAGGCTGGTCTCGAACTCCTGACCTCAGGTGATCCGCCCGCCTCGGCCTCCCAAAGT
GCTGGGATTACAGGCGTGAGCCACCGCGCCCGGCCTTTTTGAGACGGAGTCTCGCTCTGT
CGCCCAGGCTGGAGTGCAGTGGCGCGATCTCGGCTCACTGCAACCTCCGCCTCCCGGGTT
CAAGCGATTCTCCTGCCTCAGCCTCCCGAGTAGCTGGGATTACAGGCGCGCGCCACCACG
CCCGGCTAATTTTTGTATTTTTAGTAGAGACGGGGTTTCACCATGTTGGCCAGGCTGGTC
TCGAACTCCTGACCTCAGGTGATCCGCCCGCCTCGGCCTCCCAAAGTGCTGGGATTACAG
GCGTGAGCCACCGCGCCCGGCCTTTTTGAGACGGAGTCTCGCTCTGTCGCCCAGGCTGGA
GTGCAGTGGCGCGATCTCGGCTCACTGCAACCTCCGCCTCCCGGGTTCAAGCGATTCTCC
TGCCTCAGCCTCCCGAGTAGCTGGGATTACAGGCGCGCGCCACCACGCCCGGCTAATTTT
TGTATTTTTAGTAGAGACGGGGTTTCACCATGTTGGCCAGGCTGGTCTCGAACTCCTGAC
CTCAGGTGATCCGCCCGCCTCGGCCTCCCAAAGTGCTGGGATTACAGGCGTGAGCCACCG
CGCCCGGCCTTTTTGAGACGGAGTCTCGCTCTGTCGCCCAGGCTGGAGTGCAGTGGCGCG
ATCTCGGCTCACTGCAACCTCCGCCTCCCGGGTTCAAGCGATTCTCCTGCCTCAGCCTCC
CGAGTAGCTGGGATTACAGGCGCGCGCCACCACGCCCGGCTAATTTTTGTATTTTTAGTA
GAGACGGGGTTTCACCATGTTGGCCAGGCTGGTCTCGAACTCCTGACCTCAGGTGATCCG
CCCGCCTCGGCCTCCCAAAGTGCTGGGATTACAGGCGTGAGCCACCGCGCCCGGCCTTTT
TGAGACGGAGTCTCGCTCTGTCGCCCAGGCTGGAGTGCAGTGGCGCGATCTCGGCTCACT
GCAACCTCCGCCTCCCGGGTTCAAGCGATTCTCCTGCCTCAGCCTCCCGAGTAGCTGGGA
TTACAGGCGCGCGCCACCACGCCCGGCTAATTTTTGTATTTTTAGTAGAGACGGGGTTTC
ACCATGTTGGCCAGGCTGGTCTCGAACTCCTGACCTCAGGTGATCCGCCCGCCTCGGCCT
CCCAAAGTGCTGGGATTACAGGCGTGAGCCACCGCGCCCGGCCTTTTTGAGACGGAGTCT
CGCTCTGTCGCCCAGGCTGGAGTGCAGTGGCGCGATCTCGGCTCACTGCAACCTCCGCCT
CCCGGGTTCAAGCGATTCTCCTGCCTCAGCCTCCCGAGTAGCTGGGATTACAGGCGCGCG
CCACCACGCCCGGCTAATTTTTGTATTTTTAGTAGAGACGGGGTTTCACCATGTTGGCCA
GGCTGGTCTCGAACTCCTGACCTCAGGTGATCCGCCCGCCTCGGCCTCCCAAAGTGCTGG
GATTACAGGCGTGAGCCACCGCGCCCGGCCTTTTTGAGACGGAGTCTCGCTCTGTCGCCC
AGGCTGGAGTGCAGTGGCGCGATCTCGGCTCACTGCAACCTCCGCCTCCCGGGTTCAAGC
GATTCTCCTGCCTCAGCCTCCCGAGTAGCTGGGATTACAGGCGCGCGCCACCACGCCCGG
CTAATTTTTGTATTTTTAGTAGAGACGGGGTTTCACCATGTTGGCCAGGCTGGTCTCGAA
CTCCTGACCTCAGGTGATCCGCCCGCCTCGGCCTCCCAAAGTGCTGGGATTACAGGCGTG
AGCCACCGCGCCCGGCCTTTTTGAGACGGAGTCTCGCTCTGTCGCCCAGGCTGGAGTGCA
GTGGCGCGATCTCGGCTCACTGCAACCTCCGCCTCCCGGGTTCAAGCGATTCTCCTGCCT
CAGCCTCCCGAGTAGCTGGGATTACAGGCGCGCGCCACCACGCCCGGCTAATTTTTGTAT
TTTTAGTAGAGACGGGGTTTCACCATGTTGGCCAGGCTGGTCTCGAACTCCTGACCTCAG
GTGATCCGCCCGCCTCGGCCTCCCAAAGTGCTGGGATTACAGGCGTGAGCCACCGCGCCC
GGCCTTTTTGAGACGGAGTCTCGCTCTGTCGCCCAGGCTGGAGTGCAGTGGCGCGATCTC
GGCTCACTGCAACCTCCGCCTCCCGGGTTCAAGCGATTCTCCTGCCTCAGCCTCCCGAGT
AGCTGGGATTACAGGCGCGCGCCACCACGCCCGGCTAATTTTTGTATTTTTAGTAGAGAC
GGGGTTTCACCATGTTGGCCAGGCTGGTCTCGAACTCCTGACCTCAGGTGATCCGCCCGC
CTCGGCCTCCCAAAGTGCTGGGATTACAGGCGTGAGCCACCGCGCCCGGCCTTTTTGAGA
CGGAGTCTCGCTCTGTCGCCCAGGCTGGAGTGCAGTGGCGCGATCTCGGCTCACTGCAAC
CTCCGCCTCCCGGGTTCAAGCGATTCTCCTGCCTCAGCCTCCCGAGTAGCTGGGATTACA
GGCGCGCGCCACCACGCCCGGCTAATTTTTGTATTTTTAGTAGAGACGGGGTTTCACCAT
GTTGGCCAGGCTGGTCTCGAACTCCTGACCTCAGGTGATCCGCCCGCCTCGGCCTCCCAA
AGTGCTGGGATTACAGGCGTGAGCCACCGCGCCCGGCCTTTTTGAGACGGAGTCTCGCTC
TGTCGCCCAGGCTGGAGTGCAGTGGCGCGATCTCGGCTCACTGCAACCTCCGCCTCCCGG
GTTCAAGCGATTCTCCTGCCTCAGCCTCCCGAGTAGCTGGGATTACAGGCGCGCGCCACC
ACGCCCGGCTAATTTTTGTATTTTTAGTAGAGACGGGGTTTCACCATGTTGGCCAGGCTG
GTCTCGAACTCCTGACCTCAGGTGATCCGCCCGCCTCGGCCTCCCAAAGTGCTGGGATTA
CAGGCGTGAGCCACCGCGCCCGGCCTTTTTGAGACGGAGTCTCGCTCTGTCGCCCAGGCT
GGAGTGCAGTGGCGCGATCTCGGCTCACTGCAACCTCCGCCTCCCGGGTTCAAGCGATTC
TCCTGCCTCAGCCTCCCGAGTAGCTGGGATTACAGGCGCGCGCCACCACGCCCGGCTAAT
TTTTGTATTTTTAGTAGAGACGGGGTTTCACCATGTTGGCCAGGCTGGTCTCGAACTCCT
GACCTCAGGTGATCCGCCCGCCTCGGCCTCCCAAAGTGCTGGGATTACAGGCGTGAGCCA
CCGCGCCCGGCCTTTTTGAGACGGAGTCTCGCTCTGTCGCCCAGGCTGGAGTGCAGTGGC
GCGATCTCGGCTCACTGCAACCTCCGCCTCCCGGGTTCAAGCGATTCTCCTGCCTCAGCC
TCCCGAGTAGCTGGGATTACAGGCGCGCGCCACCACGCCCGGCTAATTTTTGTATTTTTA
GTAGAGACGGGGTTTCACCATGTTGGCCAGGCTGGTCTCGAACTCCTGACCTCAGGTGAT
CCGCCCGCCTCGGCCTCCCAAAGTGCTGGGATTACAGGCGTGAGCCACCGCGCCCGGCCT
TTTTGAGACGGAGTCTCGCTCTGTCGCCCAGGCTGGAGTGCAGTGGCGCGATCTCGGCTC
ACTGCAACCTCCGCCTCCCGGGTTCAAGCGATTCTCCTGCCTCAGCCTCCCGAGTAGCTG
GGATTACAGGCGCGCGCCACCACGCCCGGCTAATTTTTGTATTTTTAGTAGAGACGGGGT
TTCACCATGTTGGCCAGGCTGGTCTCGAACTCCTGACCTCAGGTGATCCGCCCGCCTCGG
CCTCCCAAAGTGCTGGGATTACAGGCGTGAGCCACCGCGCCCGGCCTTTTTGAGACGGAG
TCTCGCTCTGTCGCCCAGGCTGGAGTGCAGTGGCGCGATCTCGGCTCACTGCAACCTCCG
CCTCCCGGGTTCAAGCGATTCTCCTGCCTCAGCCTCCCGAGTAGCTGGGATTACAGGCGC
GCGCCACCACGCCCGGCTAATTTTTGTATTTTTAGTAGAGACGGGGTTTCACCATGTTGG
CCAGGCTGGTCTCGAACTCCTGACCTCAGGTGATCCGCCCGCCTCGGCCTCCCAAAGTGC
TGGGATTACAGGCGTGAGCCACCGCGCCCGGCCTTTTTGAGACGGAGTCTCGCTCTGTCG
CCCAGGCTGGAGTGCAGTGGCGCGATCTCGGCTCACTGCAACCTCCGCCTCCCGGGTTCA
AGCGATTCTCCTGCCTCAGCCTCCCGAGTAGCTGGGATTACAGGCGCGCGCCACCACGCC
CGGCTAATTTTTGTATTTTTAGTAGAGACGGGGTTTCACCATGTTGGCCAGGCTGGTCTC
GAACTCCTGACCTCAGGTGATCCGCCCGCCTCGGCCTCCCAAAGTGCTGGGATTACAGGC
GTGAGCCACCGCGCCCGGCCTTTTTGAGACGGAGTCTCGCTCTGTCGCCCAGGCTGGAGT
GCAGTGGCGCGATCTCGGCTCACTGCAACCTCCGCCTCCCGGGTTCAAGCGATTCTCCTG
CCTCAGCCTCCCGAGTAGCTGGGATTACAGGCGCGCGCCACCACGCCCGGCTAATTTTTG
TATTTTTAGTAGAGACGGGGTTTCACCATGTTGGCCAGGCTGGTCTCGAACTCCTGACCT
CAGGTGATCCGCCCGCCTCGGCCTCCCAAAGTGCTGGGATTACAGGCGTGAGCCACCGCG
CCCGGCCTTTTTGAGACGGAGTCTCGCTCTGTCGCCCAGGCTGGAGTGCAGTGGCGCGAT
CTCGGCTCACTGCAACCTCCGCCTCCCGGGTTCAAGCGATTCTCCTGCCTCAGCCTCCCG
AGTAGCTGGGATTACAGGCGCGCGCCACCACGCCCGGCTAATTTTTGTATTTTTAGTAGA
GACGGGGTTTCACCATGTTGGCCAGGCTGGTCTCGAACTCCTGACCTCAGGTGATCCGCC
CGCCTCGGCCTCCCAAAGTGCTGGGATTACAGGCGTGAGCCACCGCGCCCGGCCTTTTTG
AGACGGAGTCTCGCTCTGTCGCCCAGGCTGGAGTGCAGTGGCGCGATCTCGGCTCACTGC
AACCTCCGCCTCCCGGGTTCAAGCGATTCTCCTGCCTCAGCCTCCCGAGTAGCTGGGATT
ACAGGCGCGCGCCACCACGCCCGGCTAATTTTTGTATTTTTAGTAGAGACGGGGTTTCAC
CATGTTGGCCAGGCTGGTCTCGAACTCCTGACCTCAGGTGATCCGCCCGCCTCGGCCTCC
CAAAGTGCTGGGATTACAGGCGTGAGCCACCGCGCCCGGCCTTTTTGAGACGGAGTCTCG
CTCTGTCGCCCAGGCTGGAGTGCAGTGGCGCGATCTCGGCTCACTGCAACCTCCGCCTCC
CGGGTTCAAGCGATTCTCCTGCCTCAGCCTCCCGAGTAGCTGGGATTACAGGCGCGCGCC
ACCACGCCCGGCTAATTTTTGTATTTTTAGTAGAGACGGGGTTTCACCATGTTGGCCAGG
CTGGTCTCGAACTCCTGACCTCAGGTGATCCGCCCGCCTCGGCCTCCCAAAGTGCTGGGA
TTACAGGCGTGAGCCACCGCGCCCGGCCTTTTTGAGACGGAGTCTCGCTCTGTCGCCCAG
GCTGGAGTGCAGTGGCGCGATCTCGGCTCACTGCAACCTCCGCCTCCCGGGTTCAAGCGA
TTCTCCTGCCTCAGCCTCCCGAGTAGCTGGGATTACAGGCGCGCGCCACCACGCCCGGCT
AATTTTTGTATTTTTAGTAGAGACGGGGTTTCACCATGTTGGCCAGGCTGGTCTCGAACT
CCTGACCTCAGGTGATCCGCCCGCCTCGGCCTCCCAAAGTGCTGGGATTACAGGCGTGAG
CCACCGCGCCCGGCCTTTTTGAGACGGAGTCTCGCTCTGTCGCCCAGGCTGGAGTGCAGT
GGCGCGATCTCGGCTCACTGCAACCTCCGCCTCCCGGGTTCAAGCGATTCTCCTGCCTCA
GCCTCCCGAGTAGCTGGGATTACAGGCGCGCGCCACCACGCCCGGCTAATTTTTGTATTT
TTAGTAGAGACGGGGTTTCACCATGTTGGCCAGGCTGGTCTCGAACTCCTGACCTCAGGT
GATCCGCCCGCCTCGGCCTCCCAAAGTGCTGGGATTACAGGCGTGAGCCACCGCGCCCGG
CCTTTTTGAGACGGAGTCTCGCTCTGTCGCCCAGGCTGGAGTGCAGTGGCGCGATCTCGG
CTCACTGCAACCTCCGCCTCCCGGGTTCAAGCGATTCTCCTGCCTCAGCCTCCCGAGTAG
CTGGGATTACAGGCGCGCGCCACCACGCCCGGCTAATTTTTGTATTTTTAGTAGAGACGG
GGTTTCACCATGTTGGCCAGGCTGGTCTCGAACTCCTGACCTCAGGTGATCCGCCCGCCT
CGGCCTCCCAAAGTGCTGGGATTACAGGCGTGAGCCACCGCGCCCGGCCTTTTTGAGACG
GAGTCTCGCTCTGTCGCCCAGGCTGGAGTGCAGTGGCGCGATCTCGGCTCACTGCAACCT
CCGCCTCCCGGGTTCAAGCGATTCTCCTGCCTCAGCCTCCCGAGTAGCTGGGATTACAGG
CGCGCGCCACCACGCCCGGCTAATTTTTGTATTTTTAGTAGAGACGGGGTTTCACCATGT
TGGCCAGGCTGGTCTCGAACTCCTGACCTCAGGTGATCCGCCCGCCTCGGCCTCCCAAAG
TGCTGGGATTACAGGCGTGAGCCACCGCGCCCGGCCTTTTTGAGACGGAGTCTCGCTCTG
TCGCCCAGGCTGGAGTGCAGTGGCGCGATCTCGGCTCACTGCAACCTCCGCCTCCCGGGT
TCAAGCGATTCTCCTGCCTCAGCCTCCCGAGTAGCTGGGATTACAGGCGCGCGCCACCAC
GCCCGGCTAATTTTTGTATTTTTAGTAGAGACGGGGTTTCACCATGTTGGCCAGGCTGGT
CTCGAACTCCTGACCTCAGGTGATCCGCCCGCCTCGGCCTCCCAAAGTGCTGGGATTACA
GGCGTGAGCCACCGCGCCCGGCCTTTTTGAGACGGAGTCTCGCTCTGTCGCCCAGGCTGG
AGTGCAGTGGCGCGATCTCGGCTCACTGCAACCTCCGCCTCCCGGGTTCAAGCGATTCTC
CTGCCTCAGCCTCCCGAGTAGCTGGGATTACAGGCGCGCGCCACCACGCCCGGCTAATTT
TTGTATTTTTAGTAGAGACGGGGTTTCACCATGTTGGCCAGGCTGGTCTCGAACTCCTGA
CCTCAGGTGATCCGCCCGCCTCGGCCTCCCAAAGTGCTGGGATTACAGGCGTGAGCCACC
GCGCCCGGCCTTTTTGAGACGGAGTCTCGCTCTGTCGCCCAGGCTGGAGTGCAGTGGCGC
GATCTCGGCTCACTGCAACCTCCGCCTCCCGGGTTCAAGCGATTCTCCTGCCTCAGCCTC
CCGAGTAGCTGGGATTACAGGCGCGCGCCACCACGCCCGGCTAATTTTTGTATTTTTAGT
AGAGACGGGGTTTCACCATGTTGGCCAGGCTGGTCTCGAACTCCTGACCTCAGGTGATCC
GCCCGCCTCGGCCTCCCAAAGTGCTGGGATT