将数字转成英文，小数舍弃。
echo( number_to_word(817.12) );//调用
function number_to_word( $num = '' ){
$num = ( string ) ( ( int ) $num );
if( ( int ) ( $num ) && ctype_digit( $num ) ){
$words = array( );
$num = str_replace( array( ',' , ' ' ) , '' , trim( $num ) );
$list1 = array('','one','two','three','four','five','six','seven',
'eight','nine','ten','eleven','twelve','thirteen','fourteen',
'fifteen','sixteen','seventeen','eighteen','nineteen');
$list2 = array('','ten','twenty','thirty','forty','fifty','sixty',
'seventy','eighty','ninety','hundred');
$list3 = array('','thousand','million','billion','trillion',
'quadrillion','quintillion','sextillion','septillion',
'octillion','nonillion','decillion','undecillion',
'duodecillion','tredecillion','quattuordecillion',
'quindecillion','sexdecillion','septendecillion',
'octodecillion','novemdecillion','vigintillion');
$num_length = strlen( $num );
$levels = (int) ( ( $num_length + 2 ) / 3 );
$max_length = $levels * 3;
$num = substr( '00'.$num , -$max_length );
$num_levels = str_split( $num , 3 );
foreach( $num_levels as $num_part ){
$levels--;
$hundreds = ( int ) ( $num_part / 100 );
$hundreds = ( $hundreds ? ' ' . $list1[$hundreds] . ' Hundred' . ( $hundreds == 1 ? '' : 's' ) . ' ' : '' );
$tens = ( int ) ( $num_part % 100 );
$singles = '';
if( $tens < 20 ){
$tens = ( $tens ? ' ' . $list1[$tens] . ' ' : '' );
}else{
$tens = ( int ) ( $tens / 10 );
$tens = ' ' . $list2[$tens] . ' ';
$singles = ( int ) ( $num_part % 10 );
$singles = ' ' . $list1[$singles] . ' ';
}
$words[] = $hundreds . $tens . $singles . ( ( $levels && ( int ) ( $num_part ) ) ? ' ' . $list3[$levels] . ' ' : '' );
}
$commas = count( $words );
if( $commas --> 1 ){
$commas = $commas - 1;
}
$words = implode( ', ' , $words );
//Some Finishing Touch
//Replacing multiples of spaces with one space
$words = trim( str_replace( ' ,' , ',' , trim_all( ucwords( $words ) ) ) , ', ' );
if( $commas ){
$words = str_replace_last( ',' , ' and' , $words );
}
return $words;
} else if( ! ( ( int ) $num ) ){
return 'Zero';
}
return '';
}
function trim_all( $str , $what = NULL , $with = ' ' ){
if( $what === NULL ){
// Character Decimal Use
// "\0" 0 Null Character
// "\t" 9 Tab
// "\n" 10 New line
// "\x0B" 11 Vertical Tab
// "\r" 13 New Line in Mac
// " " 32 Space
$what = "\\x00-\\x20"; //all white-spaces and control chars
}
return trim( preg_replace( "/[".$what."]+/" , $with , $str ) , $what );
}
function str_replace_last( $search , $replace , $str ) {
if( ( $pos = strrpos( $str , $search ) ) !== false ) {
$search_length = strlen( $search );
$str = substr_replace( $str , $replace , $pos , $search_length );
}
return $str;
}