How to force string to other types in php

Forcing method: 1. Add the target type enclosed in parentheses before the string variable, such as "(int)$str", "(bool)$str", "(float)$str" "; 2. Use the conversion functions intval(), floatval(), boolval(), and settype().

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php will string Force conversion to other types

#Method 1: Add the target type enclosed in parentheses before the string variable

• (int), (integer): Convert to integer type;

• (bool), (boolean): Convert to Boolean type;

• (float), (double), (real): Convert to floating point type;

• (array): Convert to array type;

• (object): Convert to object type.

Example:

<?php
header("Content-type:text/html;charset=utf-8"); 
$str = &#39;123.456abc&#39;;
$int = (int)$str;
echo &#39;变量 $int 的类型为：&#39;.gettype($int).&#39;<br>&#39;;
$float = (float)$str;
echo &#39;变量 $float 的类型为：&#39;.gettype($float).&#39;<br>&#39;;
$bool = (bool)$str;
echo &#39;变量 $bool 的类型为：&#39;.gettype($bool);
?>

2. Use the cast function

• intval(): used to get the integer value of the variable;

• floatval(): used to get the floating point value of the variable;

• boolval(): used to get the Boolean 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"); 
$str = &#39;123.456abc&#39;;
$int = intval($str);
echo &#39;变量 $int 的类型为：&#39;.gettype($int).&#39;<br>&#39;;
$float = floatval($str);
echo &#39;变量 $float 的类型为：&#39;.gettype($float).&#39;<br>&#39;;
$bool = boolval($str);
echo &#39;变量 $bool 的类型为：&#39;.gettype($bool).&#39;<br>&#39;;

$arr = settype($str,"array");
echo &#39;变量 $str 的类型为：&#39;.gettype($str);
?>

Description: 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)

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

• "string"

• "array"

• "object"

• "null" (Starting from PHP 4.2.0)

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