PHP explode returns array with count 2 but gets undefined offset when accessing second element?

Question

I'm working with php/mySQL/Apache. I have an array with two positions.

print_r($pair) returns Array ( [0] => Maria João [1] => 1 )

When I do

$pair = explode("-",$b); 
if(count($pair)==2){ 
$investigador = $pair[0]; 
$ponderacao = $pair[1]; }

it works.

When I do

$pair = explode("-",$b); 
$investigador = $pair[0]; 
$ponderacao = $pair[1]; 

it returns "Undefined offset: 1"

Is this a bug?

Thanks in advance.

Answer 1

During Explode: maybe there is a chance that the string is not containt exact match whatever you given as reference in explode and due to that the notice occur.

try this,

$investigador = (isset($pair[0]) && $pair[0]!="")?$pair[0]:"";
$ponderacao = (isset($pair[1]) && $pair[1]!="")?$pair[1]:"";

For Example,

$b = "Maria João-1";

<?php
$b = "Maria João-1";
$pair = explode("-",$b); 
echo $pair[0]."<br>";
echo $pair[1]; 
?>

OUTPUT:

Maria João
1

Now Just change the string nd try again

$b = "Maria João_1";

<?php
$b = "Maria João_1";
$pair = explode("-",$b); 
echo $pair[0]."<br>";
echo $pair[1]; 
?>

OUTPUT:

Maria João_1

E_NOTICE : type 8 -- Undefined offset: 1 -- at line 12