How to convert string to number in php

php method to convert string to number

intval() function definition and usage

intval() function is used to get the integer value of a variable.

intval() function returns the integer value of variable var by using the specified base conversion (default is decimal). intval() cannot be used with object, otherwise an E_NOTICE error will be generated and 1 will be returned.

Syntax

intval ( string [, base = 10 ] )

Parameters

string: The quantity value to be converted to integer.

base: The base used for conversion.

If base is 0, determine the base used by detecting the format of var:

If the string includes the prefix of "0x" (or "0X"), use hexadecimal (hex); otherwise,

if the string starts with "0", use octal; otherwise,

will use decimal.

Return value

Returns the integer value of var on success, and returns 0 on failure. An empty array returns 0, a non-empty array returns 1.

The maximum value depends on the operating system. The maximum signed integer range on 32-bit systems is -2147483648 to 2147483647. For example, on such a system, intval('1000000000000') would return 2147483647. On a 64-bit system, the maximum signed integer value is 9223372036854775807.

String may return 0, although it depends on the leftmost character of the string.

intval uses

<?php
echo intval(42);                      // 42
echo intval(4.2);                     // 4
echo intval(&#39;42&#39;);                    // 42
echo intval(&#39;+42&#39;);                   // 42
echo intval(&#39;-42&#39;);                   // -42
echo intval(042);                     // 34
echo intval(&#39;042&#39;);                   // 42
echo intval(1e10);                    // 1410065408
echo intval(&#39;1e10&#39;);                  // 1
echo intval(0x1A);                    // 26
echo intval(42000000);                // 42000000
echo intval(420000000000000000000);   // 0
echo intval(&#39;420000000000000000000&#39;); // 2147483647
echo intval(42, 8);                   // 42
echo intval(&#39;42&#39;, 8);                 // 34
echo intval(array());                 // 0
echo intval(array(&#39;foo&#39;, &#39;bar&#39;));     // 1

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