Can php convert an array into an int (integer) array?

can be converted. Conversion steps: 1. Use the foreach statement to traverse the array by referencing the loop, with the syntax "foreach ($arr as &$v){//loop body statement block;}"; 2. In the loop body, use intval() or The settype() function converts all array elements "$v" to int (integer) type, with the syntax "$v=intval($v);" or "settype($v,"int");".

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

php can convert arrays into int (integer) arrays , that is, the elements in the array are all integers.

In PHP, you can use the foreach statement and the intval() (settype()) function to achieve conversion.

Conversion steps:

Step 1: Use the foreach statement to traverse the array through reference loops

foreach ($arr as &$v){
    //循环体语句块;
}

Traverse the given The $arr array will assign the value of the current array to $v in each loop.

Add & before $v, so that the foreach statement will assign a value by reference instead of copying a value. In this way, operating on the array in the loop body will affect the array itself.

Step 2: In the loop body, use the intval() or settype() function to convert all array elements to int (integer) type

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

• settype(variable, "type"), used to set The variable is converted to the type specified; when type is "integer" (or "int", starting from PHP 4.2.0), it can be set to an integer.

$v=intval($v);
//或者
settype($v,"int");

Full sample code:

<?php
header('content-type:text/html;charset=utf-8');   
$arr = ["12","23",true,null,"45",2,3,4];
var_dump($arr);

foreach($arr as &$v){
//	$v=intval($v);
	settype($v,"int");
}
var_dump($arr);
?>

It can be seen that before the last element, there are An &, that's because the $value reference of the last element of the array remains after the foreach loop. We need to use unset() to destroy it.

unset($v); // 最后取消掉引用

Description:

The settype() function is used to set the type of a variable.

bool settype ( mixed &$var , string $type )

Parameter description:

• $var: variable to be converted.

• #$type: Possible values ​​for type are.

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

  • "integer" (or "int" , starting from PHP 4.2.0)

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

  • "string"

  • "array"

  • "object"

  • "null" (from PHP 4.2.0)

The settype() function will change the original variable.

Return value: TRUE when the setting is successful, FALSE when the setting fails.

Recommended learning: "PHP Video Tutorial"

The above is the detailed content of Can php convert an array into an int (integer) array?. For more information, please follow other related articles on the PHP Chinese website!