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decimal

物件導向的 BC Math 擴展包裝器/墊片。

decimal提供了基本任意精度算術的無狀態、流暢的面向對象實現，如果可用的話使用 BC Math。

您可以在此處找到有關浮點精度的更多資訊。

例子：

decimal Number; use PrestaShop decimal OperationRounding; echo (new decimal Number('0.1')) ->plus(new decimal Number('0.7')) ->times(new decimal Number('10')) ->round(0, Rounding::ROUND_FLOOR) // echoes '8'">
 use PrestaShop  decimal  decimal Number ;
use PrestaShop  decimal  Operation  Rounding ;

echo ( new decimal Number ( ' 0.1 ' ))
    -> plus ( new decimal Number ( ' 0.7 ' ))
    -> times ( new decimal Number ( ' 10 ' ))
    -> round ( 0 , Rounding:: ROUND_FLOOR )
  
// echoes '8'

安裝

透過作曲家

$ composer require prestashop/ decimal

使用參考

快速連結：

  • 實例化
  • 添加
  • 減法
  • 乘法
  • 分配
  • 比較
  • 固定精度
  • 四捨五入
  • 點移動
  • 有用的方法

實例化

建立一個新的decimal數。 

 public __construct ( string $ number [, int $ exponent = null ] ): decimal Number

有兩種方法可以實例化decimal decimal ：

decimal Number('123.456'); echo $number; // echoes '123.456'">
 // create a number from string
$ number = new PrestaShop  decimal  decimal Number ( ' 123.456 ' );
echo $ number ; // echoes '123.456'
decimal Number('123456', -3); echo $number; // echoes '123.456'">
 // exponent notation
$ number = new PrestaShop  decimal  decimal Number ( ' 123456 ' , - 3 );
echo $ number ; // echoes '123.456'

添加

傳回目前數字與另一個數字相加的計算結果。

decimal Number $addend ): decimal Number">
 public decimal Number:: plus ( decimal Number $ addend ): decimal Number

範例：

decimal Number('123.456'); $b = new PrestaShop decimal decimal Number('654.321'); echo $a->plus($b); // echoes '777.777'">
 $ a = new PrestaShop  decimal  decimal Number ( ' 123.456 ' );
$ b = new PrestaShop  decimal  decimal Number ( ' 654.321 ' );

echo $ a -> plus ( $ b ); // echoes '777.777'

減法

傳回目前數字減去另一個數字的計算結果。

decimal Number $subtrahend ): decimal Number">
 public decimal Number:: minus ( decimal Number $ subtrahend ): decimal Number

範例：

decimal Number('777.777'); $b = new PrestaShop decimal decimal Number('654.321'); echo $a->minus($b); // echoes '123.456'">
 $ a = new PrestaShop  decimal  decimal Number ( ' 777.777 ' );
$ b = new PrestaShop  decimal  decimal Number ( ' 654.321 ' );

echo $ a -> minus ( $ b ); // echoes '123.456'

乘法

傳回目前數字與另一個數字相乘的計算結果。

decimal Number $factor ): decimal Number">
 public decimal Number:: times ( decimal Number $ factor ): decimal Number

範例：

decimal Number('777.777'); $b = new PrestaShop decimal decimal Number('654.321'); echo $a->times($b); // echoes '508915.824417'">
 $ a = new PrestaShop  decimal  decimal Number ( ' 777.777 ' );
$ b = new PrestaShop  decimal  decimal Number ( ' 654.321 ' );

echo $ a -> times ( $ b ); // echoes '508915.824417'

分配

傳回目前數字除以另一個數字的計算結果，最多保留一定數量的decimal位數（預設為 6 位）。

decimal Number $divisor [, int $precision = OperationDivision::DEFAULT_PRECISION ] )">
 public decimal Number:: dividedBy ( decimal Number $ divisor [, int $ precision = Operation Division:: DEFAULT_PRECISION ] )

範例：

decimal Number('777.777'); $b = new PrestaShop decimal decimal Number('654.321'); echo $a->dividedBy($b, 0); // echoes '1' echo $a->dividedBy($b, 5); // echoes '1.18867' echo $a->dividedBy($b, 10); // echoes '1.1886780341' echo $a->dividedBy($b, 15); // echoes '1.188678034175886'">
 $ a = new PrestaShop  decimal  decimal Number ( ' 777.777 ' );
$ b = new PrestaShop  decimal  decimal Number ( ' 654.321 ' );

echo $ a -> dividedBy ( $ b , 0 );  // echoes '1'
echo $ a -> dividedBy ( $ b , 5 );  // echoes '1.18867'
echo $ a -> dividedBy ( $ b , 10 ); // echoes '1.1886780341'
echo $ a -> dividedBy ( $ b , 15 ); // echoes '1.188678034175886'

比較

傳回比較斷言的結果。

decimal Number('777.777'); $b = new PrestaShop decimal decimal Number('654.321'); $a->equals($b); // returns false $a->isLowerThan($b); // returns false $a->isLowerOrEqualThan($b); // returns false $a->isGreaterThan($b); // returns true $a->isGreaterOrEqualThan($b); // returns true // shortcut methods $a->equalsZero(); // returns false $a->isLowerThanZero(); // returns false $a->isLowerOrEqualThanZero(); // returns false $a->isGreaterThanZero(); // returns true $a->isGreaterOrEqualThanZero(); // returns true">
 $ a = new PrestaShop  decimal  decimal Number ( ' 777.777 ' );
$ b = new PrestaShop  decimal  decimal Number ( ' 654.321 ' );

$ a -> equals ( $ b );                // returns false
$ a -> isLowerThan ( $ b );           // returns false
$ a -> isLowerOrEqualThan ( $ b );    // returns false
$ a -> isGreaterThan ( $ b );         // returns true
$ a -> isGreaterOrEqualThan ( $ b );  // returns true

// shortcut methods
$ a -> equalsZero ();               // returns false
$ a -> isLowerThanZero ();          // returns false 
$ a -> isLowerOrEqualThanZero ();   // returns false
$ a -> isGreaterThanZero ();        // returns true
$ a -> isGreaterOrEqualThanZero (); // returns true

固定精度

以字串形式傳回數字，可以選擇四捨五入，並具有精確的decimal位數。 

 public decimal Number:: toPrecision ( int $ precision [, string $ roundingMode = Rounding:: ROUND_TRUNCATE ] ): string

範例：

decimal Number('123.456'); $a = new PrestaShop decimal decimal Number('-123.456'); // truncate / pad $a->toPrecision(0); // '123' $a->toPrecision(1); // '123.4' $a->toPrecision(2); // '123.45' $a->toPrecision(3); // '123.456' $a->toPrecision(4); // '123.4560' $b->toPrecision(0); // '-123' $b->toPrecision(1); // '-123.4' $b->toPrecision(2); // '-123.45' $b->toPrecision(3); // '-123.456' $b->toPrecision(4); // '-123.4560' // ceil (round up) $a->toPrecision(0, PrestaShop decimal OperationRounding::ROUND_CEIL); // '124' $a->toPrecision(1, PrestaShop decimal OperationRounding::ROUND_CEIL); // '123.5' $a->toPrecision(2, PrestaShop decimal OperationRounding::ROUND_CEIL); // '123.46' $b->toPrecision(0, PrestaShop decimal OperationRounding::ROUND_CEIL); // '-122' $b->toPrecision(1, PrestaShop decimal OperationRounding::ROUND_CEIL); // '-123.3' $b->toPrecision(2, PrestaShop decimal OperationRounding::ROUND_CEIL); // '-123.44' // floor (round down) $a->toPrecision(0, PrestaShop decimal OperationRounding::ROUND_FLOOR); // '123' $a->toPrecision(1, PrestaShop decimal OperationRounding::ROUND_FLOOR); // '123.4' $a->toPrecision(2, PrestaShop decimal OperationRounding::ROUND_FLOOR); // '123.45' $b->toPrecision(0, PrestaShop decimal OperationRounding::ROUND_FLOOR); // '-124' $b->toPrecision(1, PrestaShop decimal OperationRounding::ROUND_FLOOR); // '-123.5' $b->toPrecision(2, PrestaShop decimal OperationRounding::ROUND_FLOOR); // '-123.46' // half-up (symmetric half-up) $a->toPrecision(0, PrestaShop decimal OperationRounding::ROUND_HALF_UP); // '123' $a->toPrecision(1, PrestaShop decimal OperationRounding::ROUND_HALF_UP); // '123.5' $a->toPrecision(2, PrestaShop decimal OperationRounding::ROUND_HALF_UP); // '123.46' $b->toPrecision(0, PrestaShop decimal OperationRounding::ROUND_HALF_UP); // '-123' $b->toPrecision(1, PrestaShop decimal OperationRounding::ROUND_HALF_UP); // '-123.5' $b->toPrecision(2, PrestaShop decimal OperationRounding::ROUND_HALF_UP); // '-123.46' // half-down (symmetric half-down) $a->toPrecision(0, PrestaShop decimal OperationRounding::ROUND_HALF_DOWN); // '123' $a->toPrecision(1, PrestaShop decimal OperationRounding::ROUND_HALF_DOWN); // '123.4' $a->toPrecision(2, PrestaShop decimal OperationRounding::ROUND_HALF_DOWN); // '123.46' $a->toPrecision(0, PrestaShop decimal OperationRounding::ROUND_HALF_DOWN); // '-123' $a->toPrecision(1, PrestaShop decimal OperationRounding::ROUND_HALF_DOWN); // '-123.4' $a->toPrecision(2, PrestaShop decimal OperationRounding::ROUND_HALF_DOWN); // '-123.46' // half-even $a->toPrecision(0, PrestaShop decimal OperationRounding::ROUND_HALF_EVEN); // '123' $a->toPrecision(1, PrestaShop decimal OperationRounding::ROUND_HALF_EVEN); // '123.4' $a->toPrecision(2, PrestaShop decimal OperationRounding::ROUND_HALF_EVEN); // '123.46' $a->toPrecision(0, PrestaShop decimal OperationRounding::ROUND_HALF_EVEN); // '-123' $a->toPrecision(1, PrestaShop decimal OperationRounding::ROUND_HALF_EVEN); // '-123.4' $a->toPrecision(2, PrestaShop decimal OperationRounding::ROUND_HALF_EVEN); // '-123.46' $a = new PrestaShop decimal decimal Number('1.1525354556575859505'); $a->toPrecision(0, PrestaShop decimal OperationRounding::ROUND_HALF_EVEN); // '1' $a->toPrecision(1, PrestaShop decimal OperationRounding::ROUND_HALF_EVEN); // '1.2' $a->toPrecision(2, PrestaShop decimal OperationRounding::ROUND_HALF_EVEN); // '1.15' $a->toPrecision(3, PrestaShop decimal OperationRounding::ROUND_HALF_EVEN); // '1.152' $a->toPrecision(4, PrestaShop decimal OperationRounding::ROUND_HALF_EVEN); // '1.1525' $a->toPrecision(5, PrestaShop decimal OperationRounding::ROUND_HALF_EVEN); // '1.15255' $a->toPrecision(6, PrestaShop decimal OperationRounding::ROUND_HALF_EVEN); // '1.152535' $a->toPrecision(7, PrestaShop decimal OperationRounding::ROUND_HALF_EVEN); // '1.1525354' $a->toPrecision(8, PrestaShop decimal OperationRounding::ROUND_HALF_EVEN); // '1.15253546' $a->toPrecision(9, PrestaShop decimal OperationRounding::ROUND_HALF_EVEN); // '1.152535456' $a->toPrecision(10, PrestaShop decimal OperationRounding::ROUND_HALF_EVEN); // '1.1525354556'">
 $ a = new PrestaShop  decimal  decimal Number ( ' 123.456 ' );
$ a = new PrestaShop  decimal  decimal Number ( ' -123.456 ' );

// truncate / pad
$ a -> toPrecision ( 0 ); // '123'
$ a -> toPrecision ( 1 ); // '123.4'
$ a -> toPrecision ( 2 ); // '123.45'
$ a -> toPrecision ( 3 ); // '123.456'
$ a -> toPrecision ( 4 ); // '123.4560'
$ b -> toPrecision ( 0 ); // '-123'
$ b -> toPrecision ( 1 ); // '-123.4'
$ b -> toPrecision ( 2 ); // '-123.45'
$ b -> toPrecision ( 3 ); // '-123.456'
$ b -> toPrecision ( 4 ); // '-123.4560'

// ceil (round up)
$ a -> toPrecision ( 0 , PrestaShop  decimal  Operation Rounding:: ROUND_CEIL ); // '124'
$ a -> toPrecision ( 1 , PrestaShop  decimal  Operation Rounding:: ROUND_CEIL ); // '123.5'
$ a -> toPrecision ( 2 , PrestaShop  decimal  Operation Rounding:: ROUND_CEIL ); // '123.46'
$ b -> toPrecision ( 0 , PrestaShop  decimal  Operation Rounding:: ROUND_CEIL ); // '-122'
$ b -> toPrecision ( 1 , PrestaShop  decimal  Operation Rounding:: ROUND_CEIL ); // '-123.3'
$ b -> toPrecision ( 2 , PrestaShop  decimal  Operation Rounding:: ROUND_CEIL ); // '-123.44'

// floor (round down)
$ a -> toPrecision ( 0 , PrestaShop  decimal  Operation Rounding:: ROUND_FLOOR ); // '123'
$ a -> toPrecision ( 1 , PrestaShop  decimal  Operation Rounding:: ROUND_FLOOR ); // '123.4'
$ a -> toPrecision ( 2 , PrestaShop  decimal  Operation Rounding:: ROUND_FLOOR ); // '123.45'
$ b -> toPrecision ( 0 , PrestaShop  decimal  Operation Rounding:: ROUND_FLOOR ); // '-124'
$ b -> toPrecision ( 1 , PrestaShop  decimal  Operation Rounding:: ROUND_FLOOR ); // '-123.5'
$ b -> toPrecision ( 2 , PrestaShop  decimal  Operation Rounding:: ROUND_FLOOR ); // '-123.46'

// half-up (symmetric half-up)
$ a -> toPrecision ( 0 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_UP ); // '123'
$ a -> toPrecision ( 1 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_UP ); // '123.5'
$ a -> toPrecision ( 2 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_UP ); // '123.46'
$ b -> toPrecision ( 0 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_UP ); // '-123'
$ b -> toPrecision ( 1 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_UP ); // '-123.5'
$ b -> toPrecision ( 2 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_UP ); // '-123.46'

// half-down (symmetric half-down)
$ a -> toPrecision ( 0 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_DOWN ); // '123'
$ a -> toPrecision ( 1 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_DOWN ); // '123.4'
$ a -> toPrecision ( 2 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_DOWN ); // '123.46'
$ a -> toPrecision ( 0 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_DOWN ); // '-123'
$ a -> toPrecision ( 1 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_DOWN ); // '-123.4'
$ a -> toPrecision ( 2 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_DOWN ); // '-123.46'

// half-even
$ a -> toPrecision ( 0 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_EVEN ); // '123'
$ a -> toPrecision ( 1 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_EVEN ); // '123.4'
$ a -> toPrecision ( 2 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_EVEN ); // '123.46'
$ a -> toPrecision ( 0 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_EVEN ); // '-123'
$ a -> toPrecision ( 1 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_EVEN ); // '-123.4'
$ a -> toPrecision ( 2 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_EVEN ); // '-123.46'

$ a = new PrestaShop  decimal  decimal Number ( ' 1.1525354556575859505 ' );
$ a -> toPrecision ( 0 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_EVEN );  // '1'
$ a -> toPrecision ( 1 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_EVEN );  // '1.2'
$ a -> toPrecision ( 2 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_EVEN );  // '1.15'
$ a -> toPrecision ( 3 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_EVEN );  // '1.152'
$ a -> toPrecision ( 4 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_EVEN );  // '1.1525'
$ a -> toPrecision ( 5 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_EVEN );  // '1.15255'
$ a -> toPrecision ( 6 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_EVEN );  // '1.152535'
$ a -> toPrecision ( 7 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_EVEN );  // '1.1525354'
$ a -> toPrecision ( 8 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_EVEN );  // '1.15253546'
$ a -> toPrecision ( 9 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_EVEN );  // '1.152535456'
$ a -> toPrecision ( 10 , PrestaShop  decimal  Operation Rounding:: ROUND_HALF_EVEN ); // '1.1525354556'

四捨五入

舍入的行為類似於toPrecision ，但提供「最多」一定數量的decimal位置（它不添加尾隨零）。

decimal s [, string $roundingMode = Rounding::ROUND_TRUNCATE ] ): string">
 public decimal Number:: round ( int $ max decimal s [, string $ roundingMode = Rounding:: ROUND_TRUNCATE ] ): string

範例：

decimal Number('123.456'); $a = new PrestaShop decimal decimal Number('-123.456'); // truncate / pad $a->round(0); // '123' $a->round(1); // '123.4' $a->round(2); // '123.45' $a->round(3); // '123.456' $a->round(4); // '123.456' $b->round(0); // '-123' $b->round(1); // '-123.4' $b->round(2); // '-123.45' $b->round(3); // '-123.456' $b->round(4); // '-123.456'">
 $ a = new PrestaShop  decimal  decimal Number ( ' 123.456 ' );
$ a = new PrestaShop  decimal  decimal Number ( ' -123.456 ' );

// truncate / pad
$ a -> round ( 0 ); // '123'
$ a -> round ( 1 ); // '123.4'
$ a -> round ( 2 ); // '123.45'
$ a -> round ( 3 ); // '123.456'
$ a -> round ( 4 ); // '123.456'
$ b -> round ( 0 ); // '-123'
$ b -> round ( 1 ); // '-123.4'
$ b -> round ( 2 ); // '-123.45'
$ b -> round ( 3 ); // '-123.456'
$ b -> round ( 4 ); // '-123.456'

點移動

創建該數字乘以 10^指數的新副本

decimal Number">
 public decimal Number:: toMagnitude ( int $ exponent ): decimal Number

範例：

decimal Number('123.456789'); // shift 3 digits to the left $a->toMagnitude(-3); // 0.123456789 // shift 3 digits to the right $a->toMagnitude(3); // 123456.789">
 $ a = new PrestaShop  decimal  decimal Number ( ' 123.456789 ' );

// shift 3 digits to the left
$ a -> toMagnitude (- 3 ); // 0.123456789

// shift 3 digits to the right
$ a -> toMagnitude ( 3 ); // 123456.789

有用的方法

decimal Number('123.45'); $number->getIntegerPart(); // '123' $number->getFractionalPart(); // '45' $number->getPrecision(); // '2' (number of decimal s) $number->getSign(); // '' ('-' if the number was negative) $number->getExponent(); // '2' (always positive) $number->getCoefficient(); // '123456' $number->isPositive(); // true $number->isNegative(); // false $number->invert(); // new decimal decimal Number('-123.45')">
 $ number = new PrestaShop  decimal  decimal Number ( ' 123.45 ' );
$ number -> getIntegerPart ();    // '123'
$ number -> getFractionalPart (); // '45'
$ number -> getPrecision ();      // '2' (number of decimal s)
$ number -> getSign ();           // '' ('-' if the number was negative)
$ number -> getExponent ();       // '2' (always positive)
$ number -> getCoefficient ();    // '123456'
$ number -> isPositive ();        // true
$ number -> isNegative ();        // false
$ number -> invert ();            // new decimal  decimal Number('-123.45')

測試

$ composer install
$ vendor/bin/phpunit

貢獻

詳細資訊請參閱貢獻。

製作人員

  • 所有貢獻者

執照

麻省理工學院許可證 (MIT)。請參閱許可證文件以獲取更多資訊。

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