double doubleval (mixed var)
Returns the double (floating point) value of var.
Var may be any scalar type. You cannot use doubleval() on arrays or objects.
$var = '122.34343The';
$double_value_of_var = doubleval ($var);
print $double_value_of_var; // prints 122.34343
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See also intval(), strval(), settype() and Type juggling.