read-json-stream.php

<?php
  // Gets indiivudal objects from a json string
// By checking for opening and closing brackets
// While ensuring they're all the same size
// - Daniel L. 2017-12-14
function getObject($stream) {
	$openbrackets = 0;
	$closedbrackets = 0;
	$instr = false;
	$startPos = 0;
	$endPos = 0;
	// Read only while we haven't reached end of line
	while(!feof($stream)) {
		// Get single character in stream
		switch(fgetc($stream)) {
			// Ensure that we're not inside a string
			case '"':
			$instr = !$instr;
			break;
			case '{':
			if($instr) { break; } // Don't count if we're inside a string
			// If this is our first open bracket
			// Set start position of the object
			if($openbrackets == 0) { $startPos = ftell($stream)-1; } 
			$openbrackets++;
			break;
			case '}':
			if($instr) { break; } // Don't count if we're inside a string
			$closedbrackets++;
			break;
		}
		// Check if we have as many open as closed brackets (but not 0)
		if($openbrackets == $closedbrackets && $openbrackets != 0) {
			// Get end position
			$endPos = ftell($stream);
			// Return object string
			return stream_get_contents($stream, $endPos-$startPos, $startPos);
		}
	}
	// End of stream has been reached and no object was found
	return null;
}