add consecutive auto iteration test #1550

	name: Check PHP syntax
	on:
	push:
	pull_request:
	schedule:
	- cron: '0 0 * * *'
	jobs:
	tests:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: true
	matrix:
	php: [ 7.2 ]
	name: Check PHP ${{ matrix.php }} syntax
	steps:
	- name: Checkout code
	uses: actions/checkout@v2
	- name: Setup PHP
	uses: shivammathur/setup-php@v2
	with:
	php-version: ${{ matrix.php }}
	extensions: dom, curl, libxml, mbstring, zip
	- name: Execute check PHP syntax
	run: find src/ examples/ -type f -name '*.php' -print0 \| xargs -0 -L 1 -P 4 php -l

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