Check if the type of a variable is integer

                
                    <?php
                    // Check if the type of a variable is integer   
                    $x = 5985;
                    var_dump(is_int($x));
                    
                    echo "<br>";
                    
                    // Check again... 
                    $x = 59.85;
                    var_dump(is_int($x));
                    ?>
                
                

Check if the type of a variable is float

                
                    <?php
                    // Check if the type of a variable is float 
                    $x = 10.365;
                    var_dump(is_float($x));
                    ?>
                
                

Check if a numeric value is finite or infinite

                
                    <?php
                    // Check if a numeric value is finite or infinite 
                    $x = 1.9e411;
                    var_dump($x);
                    ?>
                
                

Invalid calculation will return a NaN value

                
                    <?php
                    // Invalid calculation will return a NaN value
                    $x = acos(8);
                    var_dump($x);
                    ?> 
                
                

Check if a variable is numeric

                
                    <?php
                    // Check if the variable is numeric   
                    $x = 5985;
                    var_dump(is_numeric($x));
                    
                    echo "<br>";
                    
                    $x = "5985";
                    var_dump(is_numeric($x));
                    
                    echo "<br>";
                    
                    $x = "59.85" + 100;
                    var_dump(is_numeric($x));
                    
                    echo "<br>";
                    
                    $x = "Hello";
                    var_dump(is_numeric($x));
                    ?>
                
                

Cast float and string to integer

                
                    <?php
                    // Cast float to int 
                    $x = 23465.768;
                    $int_cast = (int)$x;
                    echo $int_cast;
                      
                    echo "<br>";
                    
                    // Cast string to int
                    $x = "23465.768";
                    $int_cast = (int)$x;
                    echo $int_cast;
                    ?>