check if number is negative php code example

Example 1: check if string is number or not php

$var_num = "1";
$var_str = "Hello World";

var_dump( is_numeric($var_num), is_numeric($var_str) );

/* 
Output -
 bool(true)
 bool(false)
*/

Example 2: php check if input is int

$a = 5; //returns true
$a = "5"; //returns false
$a = 5.3; //returns false
is_int($a);

Example 3: check number is positive or negative in php

if($number > 0){
  echo "the number is positive";
}
elseif($number < 0){
  echo "the number is negative";
}
else{
  echo "the number is zero";
}