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PHP string definition methods and their differences

May 02, 2018 am 11:01 AM
php the difference string

This article mainly introduces the definition methods of PHP strings and their differences. It has certain reference value. Now I share it with you. Friends in need can refer to it

  • Single quotes:

## Single quotes cannot parse variables

Single quotes cannot parse escape characters, they can only parse single quotes and backslashes themselves


You can use

. to connect variables and variables, variables and strings, and strings and strings

  • # Double quotation marks

This dual quotation can resolve variables, variables can use special characters and {} contain

dual quotation marks to analyze all transfers Characters


Variables and variables, variables and strings, strings and strings can be connected using

.

$sql = "select * from user where name = '{$name}'";-->select * from user where name = 'lisi'


$ sql = 'select * from user where name = \''.$name.'\''; //More efficient

  • The difference between single quotes and double quotes

# Single quotation number is higher than the double quotes

## The function is similar to the double quotes


#

1

2

3

4

5

$str = <<<EODExample of string

spanning multiple lines

using heredoc syntax.

EOD;

$str = <<<"FOOBAR"Hello World!FOOBAR;

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There cannot be any other symbols before the end identifier (indentation is not allowed)

  • nowdoc

Function is similar to single quotes

1

2

3

4

$str = <<<&#39;EOD&#39;Example of string

spanning multiple lines

using nowdoc syntax.

EOD;

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  • ##Both are used to process large text

  • Related recommendations:

Explanation of PHP string to array and array to string functions




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