Php 代码没有那么臃肿。当然，这是使用准备好的语句时要遵循的模板。 $mysqli = mysqli_connect($config['host'], $config['user'], $config['pass'], $config['db']); $stmt

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代码没有那么臃肿。当然，这是使用准备好的语句时要遵循的模板。

$mysqli = mysqli_connect($config['host'], $config['user'], $config['pass'], $config['db']);
$stmt = $mysqli->prepare("SELECT * FROM licences WHERE generated = ?");
$stmt->bind_param('i', $core['id']);
$result = $stmt->execute();
$stmt->store_result();

if ($stmt->num_rows >= "1") {

    while($data = $result->fetch_assoc()){ 
        //Loop through results here $data[] 
    }

}else{

    echo "0 records found";

}

$result = $stmt->execute(); //execute() tries to fetch a result set. Returns true on succes, false on failure.
$stmt->store_result(); //store_result() "binds" the last given answer to the statement-object for... reasons. Now we can use it!

if ($stmt->num_rows >= "1") { //Uses the stored result and counts the rows.

  while($data = $result->fetch_assoc()){ 
        //And here, the answer-object is turned into an array-(object)
        // which can be worked with nicely.
        //It loops trough all entries in the array.
  }

}else{

   echo "0 records found";
}

$result = $stmt->execute(); /* function returns a bool value */

/*STEP 1*/
$mysqli = mysqli_connect($servername,$usrname,$pswd,$dbname);
/*STEP 2*/
$stmt = $mysqli->prepare("SELECT * FROM licences WHERE generated = ?");
/*Prepares the SQL query, and returns a statement handle to be used for further operations on the statement.*/
//mysqli_prepare() returns a statement object(of class mysqli_stmt) or FALSE if an error occurred.
/* STEP 3*/
$stmt->bind_param('i', $core['id']);//Binds variables to a prepared statement as parameters
/* STEP 4*/
$result = $stmt->execute();//Executes a prepared Query
/* IF you wish to count the no. of rows only then you will require the following 2 lines */
$stmt->store_result();//Transfers a result set from a prepared statement
$count=$stmt->num_rows;
/*STEP 5*/
//The best way is to bind result, its easy and sleek
while($data = $stmt->fetch()) //use fetch() fetch_assoc() is not a member of mysqli_stmt class
{ //DO what you wish
  //$data is an array, one can access the contents like $data['attributeName']
}

$stmt->execute();
$result = $stmt->get_result(); //$result is of type mysqli_result
$num_rows = $result->num_rows;  //count number of rows in the result

// the '=' in the if statement is intentional, it will return true on success or false if it fails.
if ($result_array = $result->fetch_assoc(MYSQLI_ASSOC)) { 
       //loop through the result_array fetching rows.
       // $ rows is an array populated with all the rows with an associative array with column names as the key 
        for($j=0;$j<$num_rows;$j++)
            $rows[$j]=$result->fetch_row();
        var_dump($rows);
   }
else{
   echo 'Failed to retrieve rows';
}

$stmt_result = $stmt->get_result();
var_dump($stmt_result);

object(mysqli_result)[3]
  public 'current_field' => int 0
  public 'field_count' => int 10
  public 'lengths' => null
  public 'num_rows' => int 8  #That we need!
  public 'type' => int 0

#Prepare stmt or reports errors
($stmt = $mysqli->prepare($query)) or trigger_error($mysqli->error, E_USER_ERROR);

#Execute stmt or reports errors
$stmt->execute() or trigger_error($stmt->error, E_USER_ERROR);

#Save data or reports errors
($stmt_result = $stmt->get_result()) or trigger_error($stmt->error, E_USER_ERROR);

#Check if are rows in query
if ($stmt_result->num_rows>0) {

  # Save in $row_data[] all columns of query
  while($row_data = $stmt_result->fetch_assoc()) {
    # Action to do
    echo $row_data['my_db_column_name_or_ALIAS'];
  }

} else {
  # No data actions
  echo 'No data here :(';
}
$stmt->close();

<?php

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli($config['host'], $config['user'], $config['pass'], $config['db']);
$mysqli->set_charset('utf8mb4'); // Don't forget to set the charset!

$stmt = $mysqli->prepare("SELECT * FROM licences WHERE generated = ?");
$stmt->bind_param('i', $core['id']);
$stmt->execute(); // This doesn't return any useful value
$result = $stmt->get_result();
$data = $result->fetch_all(MYSQLI_ASSOC);

if ($data) {
    foreach ($data as $row) {
        //Loop through results here
    }
} else {
    echo "0 records found";
}