read and write php array to json file

JsonTexter.php

<?php
/*
Class for reading and writing array data in json format
Author: Sarfraz Ahmed (sarfraznawaz2005@gmail.com)
*/
class JsonTexter
{
    protected $file = null;
   
    public function __construct($file)
    {
        $this->file = $file;
    }
   
    // write array data to file by appending to previous contents
    public function write(array $contents, $allowDuplicate = true)
    {
        $result = false;
      
        if (! $allowDuplicate) {
            $isDuplicate = $this->search($contents);
         
            if (! $isDuplicate) {
                $result = file_put_contents($this->file, json_encode($contents) . PHP_EOL, FILE_APPEND | LOCK_EX);
            }
        } else {
            $result = file_put_contents($this->file, json_encode($contents) . PHP_EOL, FILE_APPEND | LOCK_EX);
        }
      
        return $result;
    }
   
    // write new file, useful for writing array data once in one call
    public function writeTruncated(array $contents)
    {
        return file_put_contents($this->file, json_encode($contents) . PHP_EOL, LOCK_EX);
    }
   
    // returns plain contents of written file
    public function readPlain($skipEmptyLines = false)
    {
        $contents = '';
      
        if ($skipEmptyLines) {
            $lines = file($this->file, FILE_SKIP_EMPTY_LINES);
        } else {
            $lines = file($this->file);
        }
      
        foreach ($lines as $line_num => $line) {
            $contents .= "Line #<b>{$line_num}</b> : " . htmlspecialchars($line) . "<br />\n";
        }
      
        return $contents;
    }
   
    // returns written json data as array
    public function readAsArray($skipEmptyLines = false)
    {
        $array = array();
      
        if ($skipEmptyLines) {
            $lines = file($this->file, FILE_SKIP_EMPTY_LINES);
        } else {
            $lines = file($this->file);
        }
      
        foreach ($lines as $line_num => $line) {
            $array[] = json_decode($line, true);
        }
      
        return $array;
    }
   
    // returns written data as plain human readable table format
    public function readAsPlainTable()
    {
        return $this->toTable($this->readAsArray());
    }
   
    // returns written data as html table
    public function readAsHTMLTable()
    {
        return $this->array2Html($this->readAsArray());
    }
    
    // search in given file for specified array
    public function search(array $array)
    {
        $data = $this->readAsArray();
      
        if ($data) {
            foreach ($data as $subArray) {
                if ($array === $subArray) {
                    return true;
                }
            }
        }
      
        return false;
    }    
   
    // converts array to human readable plain table
    protected function toTable($data)
    {
        $keys = array_keys(end($data));
        $size = array_map('strlen', $keys);
   
        foreach (array_map('array_values', $data) as $e) {
            $size = array_map(
                'max',
                $size,
                array_map('strlen', $e)
            );
        }
   
        foreach ($size as $n) {
            $form[] = "%-{$n}s";
            $line[] = str_repeat('-', $n);
        }
   
        $form = '| ' . implode(' | ', $form) . " |\n";
        $line = '+-' . implode('-+-', $line) . "-+\n";
        $rows = array(vsprintf($form, $keys));
   
        foreach ($data as $e) {
            $rows[] = vsprintf($form, $e);
        }
   
        echo "<pre>\n";
        echo $line . implode($line, $rows) . $line;
        echo "</pre>\n";
    }
   
    // converts array to html table
    protected function array2Html($array, $table = true)
    {
        $out = '';
        $tableHeader = '';
        
        foreach ($array as $key => $value) {
            if (is_array($value)) {
                if (!isset($tableHeader)) {
                    $tableHeader =
                       '<th>' .
                       implode('</th><th>', array_keys($value)) .
                       '</th>';
                }
                array_keys($value);
                $out .= '<tr>';
                $out .= $this->array2Html($value, false);
                $out .= '</tr>';
            } else {
                $out .= "<td>$value</td>";
            }
        }
   
        if ($table) {
            return '<table width="100%" align="center" border="1" cellpadding="4" cellspacing="0">' . $tableHeader . $out . '</table>';
        } else {
            return $out;
        }
    }
}

// example usage
//////////////////////

/*
$jt = new JsonTexter('data.json');
$jt->write(array("name" => "Sarfraz", "City" => "Karachi"));
$jt->write(array("name" => "Ahmed", "City" => "Lahore"));
$jt->write(array("name" => "Imran", "City" => "Multan"));

echo ($jt->readAsPlainTable());
echo ($jt->readAsHTMLTable());
*/