PHP class doesn't recognize this->method() [closed] - php

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When trying to access a method I've defined in a PHP class from within another method in the same class, I get the following error:
Parse error: syntax error, unexpected '->' (T_OBJECT_OPERATOR) in /var/www/.../TOC.php on line 57
Previously, I'd these functions sitting outside of any class, just including them where I needed them. Having moved them into one, at first I thought I must be having the issue this user was having, but with an instance of the class, I can call my render method from another file with no problems. Commenting out the line this->printTreeArray($sectionProjects); eliminates the error. Here's my class:
<?php
class TOC{
private function printTreeArray($sectionProjects){
echo "var TOCnodes = [\n";
//Print each section, with another loop to print each one's problems
$i = 0;
foreach($sectionProjects as $sectionProject){
if($i != 0){
echo ",\n";
}
$project = $sectionProject->getProject();
//Get due date for mouseover text
$due = $project->getDueDate('F jS, Y h:i A');
$q = new ProjectProblemQuery();
$projectProblems = $q->findByRelProjectId($project->getId());
$pId = $i + 1;
echo "{id: $pId, pId: 0, name: \"Project $pId\", title: \"Due: $due\", isParent: true, open: true}";
//Print this section's problem list
$probId = 1;
foreach($projectProblems as $projectProblem){
echo ",\n";
$nodeId = ($pId * 10) + $j;
echo "{id: $nodeId, pId: $pId, name: \"$pId.$probId\", url: \"#\", target: \"_top\"}";
$j++;
}
$i++;
}
echo"];\n";
}
public function render($section){
if(! $section instanceof Section){
echo "$section is not an instance of Section!";
}
else{
echo "<ul id=\"TOCtree\" class=\"ztree\"></ul>\n";
echo "<script type=\"text/javascript\">\n";
$sectionProjects = $section->getSectionProjects();
this->printTreeArray($sectionProjects);
echo "$(document).ready(function () {
$.fn.zTree.init($(\"#TOCtree\"), setting, TOCnodes);
});";
echo "</script>";
}
}
}
This is my first time asking a question on SO - generally I've been able to find answers to my coding dilemmas, but this one has me baffled. I realize there's a lot of not-elegant stuff going on in this class, so if there's a point of style I can use to avoid this sort of error in the future, I'd greatly appreciate getting to learn it.

Answer 1

You should use $this instead of this.