Travis matrix generator for Yoast SEO.

matrix.php

<?php

$php_max = 7.0;
$php_min = 5.2;

$php_versions = array_filter( range( $php_max, $php_min + 0.1, 0.1 ), function ( $version ) {
	return version_compare( $version, 5.6, '<=' ) || version_compare( $version, 7.0, '>=' );
} );

$wp_max = 4.6;
$wp_min = 4.4;

$include = [ ];

// bleeding edge with all checks
$include[] = [
	'php' => number_format( $php_max, 1 ),
	'env' => [
		'WP_VERSION'          => 'master',
		'WP_MULTISITE'        => 1,
		'PHPLINT'             => 1,
		'PHPCS'               => 1,
		'CHECKJS'             => 1,
		'COVERAGE'            => 1,
		'TRAVIS_NODE_VERSION' => 'node',
	],
];

// minimum PHP with multisite and lint
$include[] = [
	'php' => number_format( $php_min, 1 ),
	'env' => [
		'WP_VERSION'   => number_format( $wp_max, 1 ),
		'WP_MULTISITE' => 1,
		'PHPLINT'      => 1,
	],
];

// every WP version with stable PHP
$wp = $wp_max;
do {
	$php = ( $wp < 4.3 && $php_max > 5.6 ) ? 5.6 : $php_max;

	$include[] = [
		'php' => number_format( $php, 1 ),
		'env' => [
			'WP_VERSION' => number_format( $wp, 1 )
		],
	];
	$wp -= 0.1;
} while ( $wp >= $wp_min );

// every PHP version with current WP
foreach ( $php_versions as $php ) {
	$include[] = [
		'php' => number_format( $php, 1 ),
		'env' => [
			'WP_VERSION' => number_format( $wp_max, 1 )
		],
	];
}

// HHVM
$include[] = [
	'php' => 'hhvm',
	'env' => [
		'WP_VERSION' => number_format( $wp_max, 1 )
	],
];

$include = array_unique( $include, SORT_REGULAR );

$output = <<<MATRIX
matrix:
  allow_failures:
    - php: hhvm
  include:

MATRIX;

foreach ( $include as $item ) {
	$output .= "    - php: {$item['php']}\n";
	$output .= "      env:";

	foreach ( $item['env'] as $key => $value ) {
		$output .= " {$key}={$value}";
	}

	$output .= "\n";
}

echo $output;

it doesn`t include disabling xdebug to speed up

Not sure what you mean, this just makes a matrix part — not a whole file.