PHP - Fatal error when calling function (undefined function error)

Question

I have a newbie issue with PHP functions calls. File:

 <?php session_start(); include("../conexionbbdd.php"); include("../conexionapi.php"); $id = $_SESSION['id']; $inclass = $_SESSION['inclass']; if($_SESSION['estado'] == 'activo'){ if($inclass==='1'){ checkCost(); } else{ sendMessage(); } function checkCost(){ //DO WHATEVER } function sendMessage(){ //DO WHATEVER } }else{ header('location:../login.php'); } ?>

Console emerges an error ( ! ) Fatal error: Call to undefined function checkCost() in C:\wamp\www[removedbyme]\actions\msg_newMessage.php on line 14

put the function before it's call, especially in case it's not at top-level.. — bwoebi
– bwoebi, Commented Sep 11, 2015 at 10:25

jhmckimm · Accepted Answer · 2015-09-11 10:29:42Z

3

Functions must be declared before they are used.

This will work:

function doSomething(){ } doSomething();

This won't:

doSomething(); function doSomething(){ }

answered Sep 11, 2015 at 10:29

jhmckimm

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1 Comment

Biomehanika Over a year ago

Thank you. I'lll tick in 3 minutes

Allan Andrade · Accepted Answer · 2015-09-11 10:30:33Z

Try this:

 session_start(); include("../conexionbbdd.php"); include("../conexionapi.php"); function checkCost(){ //DO WHATEVER } function sendMessage(){ //DO WHATEVER } $id = $_SESSION['id']; $inclass = $_SESSION['inclass']; if($_SESSION['estado'] == 'activo'){ if($inclass==='1'){ checkCost(); } else{ sendMessage(); } }else{ header('location:../login.php'); }

Ngob · Accepted Answer · 2015-09-11 10:32:32Z

PHP code is read from top to bottom, so when you call checkCost, php is not aware that checkCost exist:

<?php session_start(); include("../conexionbbdd.php"); include("../conexionapi.php"); function checkCost(){ //DO WHATEVER } function sendMessage(){ //DO WHATEVER } $id = $_SESSION['id']; $inclass = $_SESSION['inclass']; if($_SESSION['estado'] == 'activo'){ if($inclass==='1'){ checkCost(); } else{ sendMessage(); } }else{ header('location:../login.php'); } ?>

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