Online PHP editor | output for 8M9kQ

@ 2016-02-05T10:24:30Z

<?php
/*  convert 16-bit numeric string to decimal 
 */
function showDecimal( $bin, $base ) {
    
    $num = intval( $bin, $base );
    
    $num &= 0xffff;                   // using only last 16 bits
    if ( 0x8000 & $num ) {            // true if $num is negative ...
      $num =( $num - 0x010000  ); 
    }
    
    return $num;
}

$b = "ffffffbf";                      //  2s complement (hex) for
echo showDecimal($b,16),"\n";         // -65

$c = "1111111111111101";              //  2s complement (binary) for
echo showDecimal($c,2),"\n";          // -3

Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: -65 -3
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 -65 -3

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