note 120232 added to function.round

/** * Round to first significant digit * +N to +infinity * -N to -infinity * */ function round1stSignificant ( $N ) { if ( $N === 0 ) { return 0; } $x = floor ( log10 ( abs( $N ) ) ); return ( $N > 0 ) ? ceil( $N * pow ( 10, $x * -1 ) ) * pow( 10, $x ) : floor( $N * pow ( 10, $x * -1 ) ) * pow( 10, $x ); } echo round1stSignificant( 39144818 ) . PHP_EOL; echo round1stSignificant( 124818 ) . PHP_EOL; echo round1stSignificant( 0.07468 ) . PHP_EOL; echo round1stSignificant( 0 ) . PHP_EOL; echo round1stSignificant( -0.07468 ) . PHP_EOL; /** * Output * * 40000000 * 200000 * 0.08 * 0 * -0.08 * */ ---- Server IP: 72.52.91.14 Probable Submitter: 148.129.129.172 ---- Manual Page -- http://php.net/manual/en/function.round.php Edit -- https://master.php.net/note/edit/120232 Del: integrated -- https://master.php.net/note/delete/120232/integrated Del: useless -- https://master.php.net/note/delete/120232/useless Del: bad code -- https://master.php.net/note/delete/120232/bad+code Del: spam -- https://master.php.net/note/delete/120232/spam Del: non-english -- https://master.php.net/note/delete/120232/non-english Del: in docs -- https://master.php.net/note/delete/120232/in+docs Del: other reasons-- https://master.php.net/note/delete/120232 Reject -- https://master.php.net/note/reject/120232 Search -- https://master.php.net/manage/user-notes.php