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Generating an array from a pair of columns

From: Accessing Databases with Object-Oriented PHP

Video: Generating an array from a pair of columns

By default, the PDO fetch and fetchAll methods return each row of The query is then executed on the following line and on line 6, So if we save that page and then load it into a You modify the behavior of the fetchAll method And it's right down here.

Generating an array from a pair of columns

By default, the PDO fetch and fetchAll methods return each row of a result set as an array indexed both by column name and number. But you can modify this behavior in interesting ways. This is pdo_array.php, which you can find in the chapter four, 04_01 folder of the exercise files. On line 4, there's a simple select query that selects name and meaning from the names table. The query is then executed on the following line and on line 6, the results are stored as an array called names using the fetchAll method.

the results are stored as an array called names using the fetchAll method. Let's inspect the content of the names array with print_r to make it easier to read. We'll start off with a pre tag, then print_r. We'll pass it names, that array, and then a closing pre tag. So if we save that page and then load it into a browser, the result is a multidimensional array with each value listed twice.

Let's say you wanted to turn this into an associative array using each name as the key and the meaning as the value. One way to do that would be to loop through each sub-array and use the values to build a new array, but with PDO, there's a much, much simpler way. So let's see how that's done. You modify the behavior of the fetchAll method by passing it a PDO constant as an argument. So, we put the cursor between the parentheses of fetchAll and then PDO, all in uppercase, then the scope resolution operator, two colons, and what we need is fetch.

two colons, and what we need is fetch. And it's right down here. It's FETCH_KEY_PAIR. And if we save that, go back to the browser and refresh that page, we now have an associative array of the names and the meanings. And that's all there is to it. This isn't necessarily a feature you'll need to use everyday, but it's very useful to know that it exists. So let's just go back and see that again.

To create an associative array from the values in two columns, submit the query and use the fetchAll method to get the result, and pass it the constant PDO, FETCH_KEY_PAIR as the argument. The SELECT query must retrieve only two columns. The first one is used for the array keys and the second one is used for the values.

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Accessing Databases with Object-Oriented PHP

47 video lessons · 2657 viewers

David Powers
Author

 
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  1. 13m 33s
    1. Welcome
      1m 4s
    2. What you should know before watching this course
      2m 8s
    3. Using the exercise files
      4m 56s
    4. Setting SQLite permissions
      1m 11s
    5. A quick primer on using PHP objects
      4m 14s
  2. 10m 12s
    1. Overview of PHP database APIs
      4m 5s
    2. Using prepared statements
      4m 24s
    3. Using transactions
      1m 43s
  3. 48m 57s
    1. Creating a database source name
      2m 3s
    2. Connecting to a database with PDO
      7m 27s
    3. Looping directly over a SELECT query
      3m 49s
    4. Fetching a result set
      8m 3s
    5. Finding the number of results from a SELECT query
      7m 14s
    6. Checking if a SELECT query contains results
      3m 32s
    7. Executing simple non-SELECT queries
      6m 2s
    8. Getting error messages
      7m 17s
    9. Using the quote() method to sanitize user input
      3m 30s
  4. 39m 51s
    1. Binding input and output values
      2m 36s
    2. Using named parameters
      9m 51s
    3. Using question marks as anonymous placeholders
      2m 35s
    4. Passing an array of values to the execute() method
      5m 20s
    5. Binding results to variables
      7m 53s
    6. Executing a transaction
      6m 54s
    7. Closing the cursor before running another query
      4m 42s
  5. 21m 20s
    1. Generating an array from a pair of columns
      2m 44s
    2. Setting an existing object's properties with a database result
      4m 42s
    3. Creating an instance of a specific class with a database result
      6m 1s
    4. Reusing a result set
      7m 53s
  6. 38m 14s
    1. Connecting to a database with MySQLi
      5m 57s
    2. Setting the character set
      1m 57s
    3. Submitting a SELECT query and getting the number of results
      4m 4s
    4. Fetching the result
      7m 35s
    5. Rewinding the result for reuse
      3m 20s
    6. Handling non-SELECT queries
      5m 27s
    7. Getting error messages
      5m 47s
    8. Sanitizing user input with real_escape_string()
      4m 7s
  7. 27m 49s
    1. Initializing and preparing a statement
      4m 17s
    2. Binding parameters and executing a prepared statement
      5m 55s
    3. Binding output variables
      5m 6s
    4. Executing a MySQLi transaction
      7m 5s
    5. Dealing with "commands out of sync" in prepared statements
      5m 26s
  8. 24m 7s
    1. Buffered and unbuffered queries
      4m 19s
    2. Using real_query()
      6m 1s
    3. Freeing resources that are no longer needed
      2m 31s
    4. Submitting multiple queries
      6m 41s
    5. Creating an instance of a class from a result set
      4m 35s
  9. 3m 31s
    1. PDO and MySQLi compared
      3m 31s

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