In a numeric context, PHP will automatically convert any string to a numeric value. Strings will be converted into two types of numeric values, double floating number and integer, based on the following rules: The value is given by the initial portion of the string. If the string starts with valid numeric data, this will be the value used. Otherwise, the value will be 0 (zero). If the valid numeric data contains '.', 'e', or 'E', it will be converted to a double floating number. Otherwise, it will be converted to an integer.Here is a PHP script example of converting some examples:<?php $foo = 1 + "10.5";echo "\$foo=$foo; type is " . gettype ($foo) . "\n";$foo = 1 + "-1.3e3";echo "\$foo=$foo; type is " . gettype ($foo) . "\n";$foo = 1 + "bob-1.3e3";echo "\$foo=$foo; type is " . gettype ($foo) . "\n";$foo = 1 + "bob3";echo "\$foo=$foo; type is " . gettype ($foo) . "\n";$foo = 1 + "10 Small Pigs";echo "\$foo=$foo; type is " . gettype ($foo) . "\n";$foo = 4 + "10.2 Little Piggies";echo "\$foo=$foo; type is " . gettype ($foo) . "\n";$foo = "10.0 pigs " + 1;echo "\$foo=$foo; type is " . gettype ($foo) . "\n";$foo = "10.0 pigs " + 1.0;echo "\$foo=$foo; type is " . gettype ($foo) . "\n";?>This script will print:$foo=11.5; type is double$foo=-1299; type is double$foo=1; type is integer$foo=1; type is integer$foo=11; type is integer$foo=14.2; type is double$foo=11; type is double$foo=11; type is double
PHP
Topic: String
How To Convert Strings to Numbers?
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