Determination and dynamic definition of php variables

This article mainly introduces the determination and dynamic definition of PHP variables. Interested friends can refer to it. I hope it will be helpful to everyone.

The example in this article describes the use of PHP dynamic binding variables. The details are as follows:

private function bindVars($stmt,$params) {
  if ($params != null) {
    $types = ''; //initial sting with types
    foreach($params as $param) {
 //for each element, determine type and add
      if(is_int($param)) {
        $types .= 'i'; //integer
      } elseif (is_float($param)) {
        $types .= 'd'; //double
      } elseif (is_string($param)) {
        $types .= 's'; //string
      } else {
        $types .= 'b';
 //blob and unknown
      }
    }
    $bind_names[] = $types;
 //first param needed is the type string
 // eg: 'issss'
    for ($i=0; $i
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