spintax.php

<?php

function spintax($text) {
	$max = substr_count($text, '}');
	$i = 0;
	$currentPos = 0; 

	while ($currentPos < strlen($text) && ($endPos = strpos($text, '}', $currentPos)) !== false) {
		if ($i++ > $max) break;

		// Find the matching opening brace.
		$startPos = strrpos(substr($text, 0, $endPos), '{');

		// Skip if there's no matching opening brace and update the current position.
		if ($startPos === false) {
			$currentPos = $endPos + 1;
			continue;
		}
		$length = $endPos - $startPos + 1;

		// Extract the spintax string
		$spintaxString = substr($text, $startPos, $length);
		$options = explode('|', trim($spintaxString, '{}'));

		// Skip if not spintax
		if (count($options) == 1) {
			$currentPos = $endPos + 1;
			continue;
		}

		// Pick option
		$randomChoice = $options[array_rand($options)];
		$text = substr_replace($text, $randomChoice, $startPos, $length);

		$currentPos = $startPos + strlen($randomChoice);
	}

	return $text;
}



function runTest() {
	$testCases = [
		"This is a {simple|basic|plain} test of.",
		"Nested {example|test with {inner|deep {1|2|3}} values}.",
		"More {complex|challenging} example: {a|b|c is {d|e|f}|g}.",
		"Another one {here|there {now|then {quickly|slowly}}|everywhere}.",
		"{First|1st} level {with|and {second|2nd} level {including|with {third|3rd} level}}.",
		"This is my {{{handlebar}}}.",
		"This is my {{{handle|bar}}}.",
		"This is a is } my {handle|bar}."
	];

	foreach ($testCases as $testCase) {
		echo "Input: " . $testCase . "\n";
		echo "Output: " . spintax($testCase) . "\n\n";
	}
}

// runTest();