How to convert value into string in php

Conversion method: 1. Use strval(), syntax "strval(value)"; 2. Use settype(), syntax "settype (value, "string")"; 3. Use sprintf() function , the syntax is "sprintf(value)"; 4. Use the number_format() function.

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

php transfers the value Into a string

#Method 1: Use strval() function

strval(): Used to obtain the string value of a variable.

<?php
header("Content-type:text/html;charset=utf-8");
var_dump(strval(TRUE));
var_dump(strval(FALSE));
var_dump(strval(12.35));
var_dump(strval(null));
?>

Method 2: Use the settype() function

settype ($var,$type) The function is used to set the variable $var to the specified data type $type.

<?php
header("Content-type:text/html;charset=utf-8");
$num=12.63;
$bool1=TRUE;
$bool2=FALSE;
settype ($num,"string");
settype ($bool1,"string");
settype ($bool2,"string");
var_dump($num);
var_dump($bool1);
var_dump($bool2);
?>

Method 3: Use sprintf() function

sprintf() function writes the formatted string into a variable middle.

<?php
header("Content-type:text/html;charset=utf-8");
var_dump(sprintf(TRUE));
var_dump(sprintf(FALSE));
var_dump(sprintf(null));
var_dump(sprintf(12));
var_dump(sprintf("%.1f",12.35));
var_dump(sprintf("%.3f",12.35));
?>

Method 4: Use the number_format() function

number_format() can be used to format numbers by thousands grouping.

<?php
header("Content-type:text/html;charset=utf-8");
var_dump(number_format(TRUE));
var_dump(number_format(FALSE));
var_dump(number_format(null));
var_dump(number_format(12));
var_dump(number_format(12.35,1));
var_dump(number_format(12.35,3));
?>

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