ToString() equivalent in PHP

2018-07-01 01:20:10

How do I convert the value of a PHP variable to string?

I was looking for something better than concatenating with an empty string:

$myText = $myVar . '';

Like the ToString() method in Java or .NET.

You can use the casting operators:

$myText = (string)$myVar;

There are more details for string casting and conversion in the Strings section of the PHP manual, including special handling for booleans and nulls.

This is done with typecasting:

$strvar = (string) $var; // Casts to string
echo $var; // Will cast to string implicitly
var_dump($var); // Will show the true type of the variable

In a class you can define what is output by using the magical method __toString . An example is below:

class Bottles {
    public function __toString()
    {
        return 'Ninety nine green bottles';
    }
}

$ex = new Bottles;
var_dump($ex, (string) $ex);
// Returns: instance of Bottles and "Ninety nine green bottles"

Some more type casting examples:

$i = 1;

// int 1
var_dump((int) $i);

// bool true
var_dump((bool) $i);

// string "1"
var_dump((string) 1);

Use print_r :

$myText = print_r($myVar,true);

You can also use like

$myText = print_r($myVar,true)."foo bar";

this will set $myText to a string, like :

array (
  0 => '11',
)foo bar

Use var_export to get a little bit more info (with types of variable,...) :

$myText = var_export($myVar,true);

链接地址: http://www.djcxy.com/p/86616.html

上一篇: 在PHP中将整数转换为字符串

下一篇: 在PHP中相当于ToString（）