In php, what are the representations of strings?

PHP strings have 5 representations: single quotes ignore escape sequences; double quotes allow escape sequences; Heredoc syntax is used for multi-line strings and retains newlines; Nowdoc syntax is used for multi-line strings But newlines are not preserved; backslash strings provide access to object properties through property names.

PHP string representation

There are 5 representations of strings in PHP:

1. Single quote (')

Single quoted string ignores any escape sequence, including the escape character itself ('). This is the most basic and common string representation.

For example:

$str = 'Hello, world!';

2. Double quotes (")

Double quote strings allow the use of escape sequences. For example, \n represents a newline character, \t represents the tab character. For example:

$str = "Hello, world!\n";

3. Heredoc syntax

Heredoc syntax allows the use of multi-line strings, and Line breaks and other whitespace characters are preserved. It starts with

For example:

$str = <<<EOT
Hello, world!
This is a multi-line string.
EOT;

4. Nowdoc Syntax

Nowdoc syntax is similar to Heredoc syntax, but it does not preserve newlines and other whitespace characters. It starts with

. For example:

$str = <<<EOF
Hello, world! This is a multi-line string.
EOF;

5. Backslash string (my_var->{"propname"})

Backslash string is allowed by backslash ( my_var->{"propname"}) to access the properties in the object.

For example:

class MyClass {
    public $propname = 'Hello, world!';
}
$obj = new MyClass();
$str = $obj->{"propname"};

.

The above is the detailed content of In php, what are the representations of strings?. For more information, please follow other related articles on the PHP Chinese website!