convert string to int php

1intval($string);

1s = "123";
2echo intval(s); // 123
3
4s = "hello";
5echo intval(s);	//0

1phpCopy<?php  
2$variable = "abc";
3$integer = (int)$variable;
4echo "The variable has converted to a number and its value is $integer.";  
5?>
6

1$num = "3.14"; 
2$int = (int)$num;//string to int
3$float = (float)$num;//string to float

1phpCopy<?php  
2$variable = "53";
3$integer = intval($variable);
4echo "The variable $variable has converted to a number and its value is $integer.";  
5echo "\n";
6
7$variable = "25.3";
8$float = floatval($variable);
9echo "The variable $variable has converted to a number and its value is $float.";  
10?>
11

1intval ( mixed $var [, int $base = 10 ] ) : int