Show each row colums information php and sql - php

Question

I want to print the values of custom columns for all rows, I've got a sql developer file, i mean that i want to print some columns of every rows, if for example my table is named client and has name, subname and email i want to print every client name, subname and email I've found how to make it with mysql but I want to make it with php and sql developer.
The code I've shown only shows the first user name and not the rest names and other columns of other users.
<?php
function clientes($conexion) {
$consulta = "SELECT NOMBRE FROM CLIENTE";
$stmt = $conexion -> prepare($consulta);
$stmt -> execute();
return $stmt -> fetchColumn();
}
echo clientes($conexion);
?>

Answer 1

You're only getting one column since you're explicitly only ask for one column (by using fetchColumn()) and the fact that you've only told SQL to return one single column.
Change your query:
// Replace column1 etc to the real column names
SELECT column1, column2, column3 FROM CLIENTE
Then instead of using fetchColumn() (which is for fetching one column), use:
return $stmt->fetchAll(PDO::FETCH_ASSOC);
and you should get an array containing associative arrays (one per row) with all three columns.
However, you have another issue:
echo clientes($conexion);
Since you're now returning an array, you can't just echo it straight off. If you do, you will get a warning about "Array to string conversion". You need to iterate through the array and output the data as you want it:
$data = clientes($conexion);
// Again, change the column names
foreach ($data as $row) {
echo $row['column1'];
echo $row['column2'];
echo $row['column3'];
}
This will output all the data. You get to decide on the layout though.

Answer 2

I want to print every client name, subname and email i've found
Then you should use fetchall() this will fetch all the results as an array then iterate through the array and print each element of the array
function clientes($conexion) {
$stmt = $conexion ->query("SELECT name,subname,email FROM CLIENTE")->fetchall();
foreach($stmt as $row){
echo "Client Name : ".$row['name']."<br>";
echo "Client subname : ".$row['subname']."<br>";
echo "Client email : ".$row['email']."<br>";
}
}
clientes($conexion);
?>

Answer 3

For getting all columns
You need to address your SQL Query different for it to work probably. At the moment you are only looking for the field nombre. Try to change it to:
$consulta = "SELECT * FROM CLIENTE";
With the asterisk you calling all fields in the table cliente. For performance you should only call the fields your are needing. This would look like this:
$consulta = "SELECT nombre,dni,sexo FROM CLIENTE";
For getting all rows
At the moment you just address one row here. You need to change your code to
return $stmt ->fetchAll();