PHP function 与 SQL 查询不返回值

Question

I want to create a function in PHP that will return the values of an SQL query in an array. The SQL code in the function works and i can display the values.

But when i want to use it in an function, it will not work. What is the error in my syntax?

function frequenz_suchen_datum_zeit($fdatum_von = "2000-01-01", $fdatum_bis = "2020-01-01", $fuhrzeit_von = "00:00:00", $fuhrzeit_bis = "23:59:59") {
$abfrage = $pdo->query("SELECT
                SUM(hg_ger_b) as hg_ger_b,
                SUM(hg_ger_v) as hg_ger_v,
                SUM(hg_zub_b) as hg_zub_b,
                SUM(hg_zub_v) as hg_zub_v,
                SUM(hg_ers_b) as hg_ers_b,
                SUM(hg_ers_v) as hg_ers_v,
                SUM(hg_rep) as hg_rep,
                SUM(pr_ger_b) as pr_ger_b,
                SUM(pr_ger_v) as pr_ger_v,
                SUM(pr_zub_b) as pr_zub_b,
                SUM(pr_zub_v) as pr_zub_v,
                SUM(pr_ers_b) as pr_ers_b,
                SUM(pr_ers_v) as pr_ers_v,
                SUM(pr_rep) as pr_rep,
                SUM(so_ser) as so_ser, 
                SUM(so_mie) as so_mie,
                SUM(so_was) as so_was,
                SUM(so_wer) as so_wer,
                SUM(so_web) as so_web
                FROM frequenz WHERE datum BETWEEN '".$fdatum_von."' AND '".$fdatum_bis."' AND uhrzeit BETWEEN '".$fuhrzeit_von."' AND '".$fuhrzeit_bis."'")->fetch();

return abfrage;
}

$test = frequenz_suchen_datum_zeit();
echo $test [hg_ger_b];

Answer 1

As $pdo is unknown inside the function it will not work.

Quick ugly fix:

add as first line of the function:

global $pdo; 

PROBLEM: The scope of variables.

Plese see urgently: https://www.php.net/manual/de/language.variables.scope.php

full code including the global:

function frequenz_suchen_datum_zeit($fdatum_von = "2000-01-01", $fdatum_bis = "2020-01-01", $fuhrzeit_von = "00:00:00", $fuhrzeit_bis = "23:59:59") {

global $pdo;    
$abfrage = $pdo->query("SELECT
                    SUM(hg_ger_b) as hg_ger_b,
                    SUM(hg_ger_v) as hg_ger_v,
                    SUM(hg_zub_b) as hg_zub_b,
                    SUM(hg_zub_v) as hg_zub_v,
                    SUM(hg_ers_b) as hg_ers_b,
                    SUM(hg_ers_v) as hg_ers_v,
                    SUM(hg_rep) as hg_rep,
                    SUM(pr_ger_b) as pr_ger_b,
                    SUM(pr_ger_v) as pr_ger_v,
                    SUM(pr_zub_b) as pr_zub_b,
                    SUM(pr_zub_v) as pr_zub_v,
                    SUM(pr_ers_b) as pr_ers_b,
                    SUM(pr_ers_v) as pr_ers_v,
                    SUM(pr_rep) as pr_rep,
                    SUM(so_ser) as so_ser, 
                    SUM(so_mie) as so_mie,
                    SUM(so_was) as so_was,
                    SUM(so_wer) as so_wer,
                    SUM(so_web) as so_web
                    FROM frequenz WHERE datum BETWEEN '".$fdatum_von."' AND '".$fdatum_bis."' AND uhrzeit BETWEEN '".$fuhrzeit_von."' AND '".$fuhrzeit_bis."'")->fetch();
    
    return abfrage;
    }
    
    $test = frequenz_suchen_datum_zeit();
    echo $test [hg_ger_b];

Answer 2

Thanks for the quick help. Unfortunately, my code still doesn't work. Thanks for the tip with the Prepare query. I will also improve this if my function works.

I've added the revised code again.

A blank page is no longer output. My test text is output to me.

Unfortunately I still can't get the content of the function out.

function frequenz_suchen_datum_zeit($fdatum_von = "2000-01-01", $fdatum_bis = "2020-01-01", $fuhrzeit_von = "00:00:00", $fuhrzeit_bis = "23:59:59") {
global $pdo;
$abfrage = $pdo->query("SELECT
                SUM(hg_ger_b) as hg_ger_b,
                SUM(hg_ger_v) as hg_ger_v,
                SUM(hg_zub_b) as hg_zub_b,
                SUM(hg_zub_v) as hg_zub_v,
                SUM(hg_ers_b) as hg_ers_b,
                SUM(hg_ers_v) as hg_ers_v,
                SUM(hg_rep) as hg_rep,
                SUM(pr_ger_b) as pr_ger_b,
                SUM(pr_ger_v) as pr_ger_v,
                SUM(pr_zub_b) as pr_zub_b,
                SUM(pr_zub_v) as pr_zub_v,
                SUM(pr_ers_b) as pr_ers_b,
                SUM(pr_ers_v) as pr_ers_v,
                SUM(pr_rep) as pr_rep,
                SUM(so_ser) as so_ser, 
                SUM(so_mie) as so_mie,
                SUM(so_was) as so_was,
                SUM(so_wer) as so_wer,
                SUM(so_web) as so_web
                FROM frequenz WHERE datum BETWEEN '".$fdatum_von."' AND '".$fdatum_bis."' AND uhrzeit BETWEEN '".$fuhrzeit_von."' AND '".$fuhrzeit_bis."'")->fetch();

return $abfrage;
}
echo "test";
$test = frequenz_suchen_datum_zeit();
echo $test['hg_ger_b'];

I think somehow the value is not passed correctly.

But somehow I don't find the error.

Answer 3

Thank you. It works now.

function frequenz_suchen_datum_zeit($pdo, $fdatum_von="2000-01-01", $fdatum_bis="2022-01-01", $fuhrzeit_von="00:00:00", $fuhrzeit_bis="23:59:59") {
$abfrage = $pdo->query("SELECT
                SUM(hg_ger_b) as hg_ger_b,
                SUM(hg_ger_v) as hg_ger_v,
                SUM(hg_zub_b) as hg_zub_b,
                SUM(hg_zub_v) as hg_zub_v,
                SUM(hg_ers_b) as hg_ers_b,
                SUM(hg_ers_v) as hg_ers_v,
                SUM(hg_rep) as hg_rep,
                SUM(pr_ger_b) as pr_ger_b,
                SUM(pr_ger_v) as pr_ger_v,
                SUM(pr_zub_b) as pr_zub_b,
                SUM(pr_zub_v) as pr_zub_v,
                SUM(pr_ers_b) as pr_ers_b,
                SUM(pr_ers_v) as pr_ers_v,
                SUM(pr_rep) as pr_rep,
                SUM(so_ser) as so_ser, 
                SUM(so_mie) as so_mie,
                SUM(so_was) as so_was,
                SUM(so_wer) as so_wer,
                SUM(so_web) as so_web
                FROM frequenz WHERE datum BETWEEN '".$fdatum_von."' AND '".$fdatum_bis."' AND uhrzeit BETWEEN '".$fuhrzeit_von."' AND '".$fuhrzeit_bis."'")->fetch();
echo "<pre>"; print_r($abfrage); echo "</pre>";
return $abfrage;

}

$test = frequenz_suchen_datum_zeit($pdo);

echo "Testausgabe1: ";
echo $test['hg_ger_b'];

Answer 4

This is a code with an test database, i will delet it when the issue is fixed:

<?php
//Direkter Zugriff auf die Datei erlauben?

$pdo = new PDO('mysql:host=vwp14745.webpack.hosteurope.de;dbname=db12258506-test', 'db12258506-test', '12test12');

?>

This is the main code:

<?
require_once('connect.php');

error_reporting(E_ALL & ~ E_NOTICE);
ini_set ('display_errors', 'On');

//Parameter für die einzelnen Abfragen.
$fdatum_von = "2018-01-19";
$fdatum_bis = "2022-01-19";
$fuhrzeit_von = "10:00:00";
$fuhrzeit_bis = "18:33:00";

function frequenz_suchen_datum_zeit($pdo, $fdatum_von = "2000-01-01", $fdatum_bis = "2020-01-01", $fuhrzeit_von = "00:00:00", $fuhrzeit_bis = "23:59:59") {
global $pdo;
$abfrage = $pdo->query("SELECT
                SUM(hg_ger_b) as hg_ger_b,
                SUM(hg_ger_v) as hg_ger_v,
                SUM(hg_zub_b) as hg_zub_b,
                SUM(hg_zub_v) as hg_zub_v,
                SUM(hg_ers_b) as hg_ers_b,
                SUM(hg_ers_v) as hg_ers_v,
                SUM(hg_rep) as hg_rep,
                SUM(pr_ger_b) as pr_ger_b,
                SUM(pr_ger_v) as pr_ger_v,
                SUM(pr_zub_b) as pr_zub_b,
                SUM(pr_zub_v) as pr_zub_v,
                SUM(pr_ers_b) as pr_ers_b,
                SUM(pr_ers_v) as pr_ers_v,
                SUM(pr_rep) as pr_rep,
                SUM(so_ser) as so_ser, 
                SUM(so_mie) as so_mie,
                SUM(so_was) as so_was,
                SUM(so_wer) as so_wer,
                SUM(so_web) as so_web
                FROM frequenz WHERE datum BETWEEN '".$fdatum_von."' AND '".$fdatum_bis."' AND uhrzeit BETWEEN '".$fuhrzeit_von."' AND '".$fuhrzeit_bis."'")->fetch();

return $abfrage;

}
//frequenz_suchen_datum_zeit($pdo);

$test = frequenz_suchen_datum_zeit($pdo);

echo "Testausgabe1: ";
echo $test['hg_ger_b'];


echo "</br>-------------------------------------------------</br>";
//SQL Code without function
$abfrage = $pdo->query("SELECT
                SUM(hg_ger_b) as hg_ger_b,
                SUM(hg_ger_v) as hg_ger_v,
                SUM(hg_zub_b) as hg_zub_b,
                SUM(hg_zub_v) as hg_zub_v,
                SUM(hg_ers_b) as hg_ers_b,
                SUM(hg_ers_v) as hg_ers_v,
                SUM(hg_rep) as hg_rep,
                SUM(pr_ger_b) as pr_ger_b,
                SUM(pr_ger_v) as pr_ger_v,
                SUM(pr_zub_b) as pr_zub_b,
                SUM(pr_zub_v) as pr_zub_v,
                SUM(pr_ers_b) as pr_ers_b,
                SUM(pr_ers_v) as pr_ers_v,
                SUM(pr_rep) as pr_rep,
                SUM(so_ser) as so_ser, 
                SUM(so_mie) as so_mie,
                SUM(so_was) as so_was,
                SUM(so_wer) as so_wer,
                SUM(so_web) as so_web
                FROM frequenz WHERE datum BETWEEN '".$fdatum_von."' AND '".$fdatum_bis."' AND uhrzeit BETWEEN '".$fuhrzeit_von."' AND '".$fuhrzeit_bis."'")->fetch();
                
echo "Testausgabe1: ";
echo $abfrage['hg_ger_b'];
                
?>