tcpdf date error Message: Undefined offset: 2 - date

Question

i have a date (datepicker jquery) $fecha_constancia:
public function generarReporte(){
$data_b = array();
$container = $this->input->get_post('opc_report', TRUE);
$paciente = $this->input->get_post('paciente', TRUE);
$odontologo = $this->input->get_post('odontologo', TRUE);
$fecha_constancia = $this->input->get_post('fecha_constancia', TRUE);
$diagnostico = $this->input->get_post('diagnostico', TRUE);
$reposo= $this->input->get_post('reposo', TRUE);
$reposo = $reposo*7;
list($day,$mon,$year) = explode('/',$fecha_constancia);
$nueva_fecha = date('d/m/Y',mktime(0,0,0,$mon,$day+$reposo,$year));
$data_a = array(
'fecha_constancia' => $fecha_constancia,
'diagnostico' => $diagnostico,
'fecha_reposo' => $nueva_fecha,
'dias_reposo' => $reposo
but when I'm going to spend the time to the Make pdf throws me the following result:
A PHP Error was encountered
Severity: Notice
Message: Undefined offset: 2
Filename: controllers/constancia.php
Line Number: 38
A PHP Error was encountered
Severity: Notice
Message: Undefined offset: 1
Filename: controllers/constancia.php
Line Number: 38
is that the problem is in the date but not how to fix it

Answer 1

Check that the value of $fecha_constancia is an actual date in the format of Day/Month/Year.
This is line 38, correct?:
list($day,$mon,$year) = explode('/',$fecha_constancia);
Based on the error message, there's no slashes in $fecha_constancia. It can't assign anything to $mon and $year because explode is returning an array with a single element.