How to force convert data to string type in php

Two conversion methods: 1. Add the target type "(string)" enclosed in parentheses before the data, and the syntax "(string) specifies data". 2. Use the forced type conversion function strval() or settype(), with the syntax "strval(specified data)" or "settype(specified data 2, "string")".

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

php will strengthen the data Convert to string type

#Method 1: Add the target type "(string)" enclosed in parentheses before the data

• (string): Convert to string

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$n=123;
var_dump($n);
var_dump((string)$n);
echo "<hr>";

$n=true;
var_dump($n);
var_dump((string)$n);
echo "<hr>";

$n=null;
var_dump($n);
var_dump((string)$n);
echo "<hr>";
?>

##Method 2: Use cast type conversion function

• strval(): used to get the string value of a variable.

• settype(): used to set a variable to a specified type (the settype() function will change the original type of the variable).

<?php
header("Content-type:text/html;charset=utf-8"); 
$n1 = 146;
var_dump($n1);
$str = strval($n1);
echo &#39;变量 $n1 的类型为：&#39;.gettype($str).&#39;<br>&#39;;
echo "<hr>";
$n2= FALSE;
var_dump($n2);
$str = settype($n2,"string");
echo &#39;变量 $n2 的类型为：&#39;.gettype($n2);
?>



Note: The value of the second parameter (set type) of the settype() function can be:

• "boolean" (or "bool" since PHP 4.2.0)

• "integer" (or "int" since PHP 4.2.0 onwards)

##"float" (only available after PHP 4.2.0, "double" used in older versions is now disabled)
"string"
"array"

• ##"object"

• "null" (from PHP 4.2.0)

• The settype() function will affect the type of the original variable.
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