Lặp lại dấu ngoặc kép trong php

Nếu bạn cần thêm một trích dẫn bên trong một chuỗi trích dẫn thì sao? . \'

# This is the Hyvor's PHP Tutorial
$string = 'This is the Hyvor\'s PHP Tutorial';

Nếu bạn cần có \' trong một chuỗi trích dẫn thì sao? . Và, như trong ví dụ trước, \' để thoát ký tự '

# Backslash and Quote: \'
$string = 'Backslash and Quote: \\\'';

Thoát được sử dụng để giảm sự mơ hồ và mang ý nghĩa đặc biệt khi sử dụng dấu ngoặc kép. Những ký tự này được gọi là chuỗi thoát

trích dẫn kép

Các chuỗi có thể được khai báo kèm theo dấu ngoặc kép. Tính cách. "

Trong dấu ngoặc đơn, chỉ \\ và \' có ý nghĩa đặc biệt. Nhưng, trong dấu ngoặc kép, có nhiều chuỗi thoát hơn

Trình tự thoát Ý nghĩa\Ngắt dòng\Trả về vận chuyển\tTab Space\\Dấu gạch chéo ngược\$Dấu hiệu đô la\"Dấu ngoặc kép

Tất cả các ký tự thoát bắt đầu bằng dấu gạch chéo ngược \

Ví dụ chuỗi trích dẫn kép PHP

";
echo "\"Hello World\"";
echo "\n\tHello World\n";
?>

Mẹo. Lý do chúng tôi lặp lại đầu ra từ PHP bên trong
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String


";
echo "\"Hello World\"";
echo "\n\tHello World\n";
?>
8

# This is the Hyvor's PHP Tutorial
$string = 'This is the Hyvor\'s PHP Tutorial';

0

# This is the Hyvor's PHP Tutorial
$string = 'This is the Hyvor\'s PHP Tutorial';

1


# This is the Hyvor's PHP Tutorial
$string = 'This is the Hyvor\'s PHP Tutorial';

2

# This is the Hyvor's PHP Tutorial
$string = 'This is the Hyvor\'s PHP Tutorial';

3

# This is the Hyvor's PHP Tutorial
$string = 'This is the Hyvor\'s PHP Tutorial';

4

# This is the Hyvor's PHP Tutorial
$string = 'This is the Hyvor\'s PHP Tutorial';

5

# This is the Hyvor's PHP Tutorial
$string = 'This is the Hyvor\'s PHP Tutorial';

4

# This is the Hyvor's PHP Tutorial
$string = 'This is the Hyvor\'s PHP Tutorial';

7

# This is the Hyvor's PHP Tutorial
$string = 'This is the Hyvor\'s PHP Tutorial';

8

# This is the Hyvor's PHP Tutorial
$string = 'This is the Hyvor\'s PHP Tutorial';

9

# Backslash and Quote: \'
$string = 'Backslash and Quote: \\\'';

0

# Backslash and Quote: \'
$string = 'Backslash and Quote: \\\'';

1

# Backslash and Quote: \'
$string = 'Backslash and Quote: \\\'';

2

# Backslash and Quote: \'
$string = 'Backslash and Quote: \\\'';

3

# Backslash and Quote: \'
$string = 'Backslash and Quote: \\\'';

4

";
echo "\"Hello World\"";
echo "\n\tHello World\n";
?>
0

# Backslash and Quote: \'
$string = 'Backslash and Quote: \\\'';

5

# Backslash and Quote: \'
$string = 'Backslash and Quote: \\\'';

6Chạy ví dụ ››
Chuỗi Heredoc hoạt động giống như chuỗi trích dẫn kép. Nó chuyển đổi các chuỗi thoát thành ý nghĩa thực sự của chúng. Và, các biến sẽ được phân tích cú pháp
Điều tốt nhất về cú pháp tài liệu là chúng ta không cần phải thoát dấu ngoặc kép bên trong chúng. Điều này làm cho việc viết HTML, XML, SQL, v.v. chuỗi dễ dàng
 
Dấu nháy đơn hoặc kép trong lập trình PHP dùng để định nghĩa một chuỗi. Nhưng, có rất nhiều sự khác biệt giữa hai. Chuỗi trích dẫn đơn. Đây là cách dễ nhất để xác định một chuỗi. Bạn có thể sử dụng nó khi bạn muốn chuỗi chính xác như được viết. Tất cả các chuỗi thoát như \r hoặc \n, sẽ được xuất ra theo chỉ định thay vì có bất kỳ ý nghĩa đặc biệt nào. Trích dẫn đơn thường nhanh hơn trong một số trường hợp. Trường hợp đặc biệt là nếu bạn muốn hiển thị một dấu nháy đơn theo nghĩa đen, hãy thoát nó bằng dấu gạch chéo ngược (\) và nếu bạn muốn hiển thị dấu gạch chéo ngược, bạn có thể thoát nó bằng dấu gạch chéo ngược khác (\\).  
Chương trình dưới đây minh họa Chuỗi trích dẫn đơn.  
chương trình 1.  
php




";
echo "\"Hello World\"";
echo "\n\tHello World\n";
?>
9
 
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

0
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

1 
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

2
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

3
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

1____35
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

3
 

";
echo "\"Hello World\"";
echo "\n\tHello World\n";
?>
30
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

1 

";
echo "\"Hello World\"";
echo "\n\tHello World\n";
?>
32
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

3
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

1____35
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.



PHP Variables in Double Quoted String

3
 

";
echo "\"Hello World\"";
echo "\n\tHello World\n";
?>
37
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

1 

";
echo "\"Hello World\"";
echo "\n\tHello World\n";
?>
39
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

3
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

1____35
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

3
 

";
echo "\"Hello World\"";
echo "\n\tHello World\n";
?>
94

";
echo "\"Hello World\"";
echo "\n\tHello World\n";
?>
95

";
echo "\"Hello World\"";
echo "\n\tHello World\n";
?>
96 

";
echo "\"Hello World\"";
echo "\n\tHello World\n";
?>
97____298
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

3
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

1 
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

01
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

3
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

1____35
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.



PHP Variables in Double Quoted String

3
 
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

06
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

07
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

1 
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

09
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

3
 tags is those tags allows you to show the text as it is in the browser. (By default, HTML ignores extra white spaces)

In the table, you may notice the $ (dollar) sign. Why is it there? The reason is that we can add variables inside double quoted texts
Variables within Double Quoted Strings

When you add a variable within a double quoted string, PHP will parse it.
PHP Variables in Double Quoted String

11
đầu ra

";
echo "\"Hello World\"";
echo "\n\tHello World\n";
?>
7
chuỗi trích dẫn kép. Bằng cách sử dụng dấu ngoặc kép, mã PHP buộc phải đánh giá toàn bộ chuỗi. Sự khác biệt chính giữa dấu ngoặc kép và dấu ngoặc đơn là bằng cách sử dụng dấu ngoặc kép, bạn có thể bao gồm các biến trực tiếp trong chuỗi. Nó diễn giải các chuỗi Escape. Mỗi biến sẽ được thay thế bằng giá trị của nó.  
 

			
Bạn có thể sử dụng dấu ngoặc kép trong PHP không?
			
Chuỗi trích dẫn kép.  Bằng cách sử dụng dấu ngoặc kép, mã PHP buộc phải đánh giá toàn bộ chuỗi . Sự khác biệt chính giữa dấu ngoặc kép và dấu ngoặc đơn là bằng cách sử dụng dấu ngoặc kép, bạn có thể bao gồm các biến trực tiếp trong chuỗi. Nó diễn giải các chuỗi Escape. 
		
			
Làm cách nào để thêm dấu ngoặc kép vào một biến trong PHP?
			
Trong PHP, một chuỗi thoát bắt đầu bằng dấu gạch chéo ngược \. Trình tự thoát áp dụng cho chuỗi trích dẫn kép.  . 
 
\" cho một trích dẫn kép
 
\\ cho dấu gạch chéo ngược
 
\$ để hiển thị ký hiệu đô la thay vì mở rộng biến
 
\n cho một dòng mới
 
\t cho một tab
 
		
			
Tôi nên sử dụng dấu ngoặc đơn hay dấu ngoặc kép PHP?
			
Trong PHP, mọi người sử dụng  dấu nháy đơn để xác định một chuỗi hằng số , như 'a' , 'my name' , 'abc xyz' . lặp lại "$a của tôi"; . 
		
			
Bạn có thể sử dụng dấu ngoặc đơn và dấu ngoặc kép trong PHP không?
			
Nếu là ký tự đặc biệt thì nó sẽ được coi như trong quá trình phân tích chuỗi. Các chuỗi trong PHP có thể được chỉ định theo bốn cách khác nhau. Cú pháp trích dẫn đơn, trích dẫn kép, cú pháp Heredoc và cú pháp nowdac.  Trích dẫn đơn và trích dẫn kép được sử dụng thường xuyên nhất .