Drop PHP 5.6 and 7.0

This is according to our formal, published, policy to only support
eol PHP after 6 months.

See https://phpspreadsheet.readthedocs.io/en/latest/#php-version-support

.travis.yml

@@ -2,8 +2,6 @@ language: php
 dist: trusty
 
 php:
-  - 5.6
-  - 7.0
   - 7.1
   - 7.2
   - 7.3
@@ -12,7 +10,6 @@ php:
 matrix:
   fast_finish: true
   allow_failures:
-    - php: 5.6
     - php: 7.4snapshot
 
 cache:

composer.json

@@ -35,11 +35,11 @@
             "php-cs-fixer fix --ansi"
         ],
         "versions": [
-            "phpcs --report-width=200 samples/ src/ tests/ --ignore=samples/Header.php --standard=PHPCompatibility --runtime-set testVersion 5.6- -n"
+            "phpcs --report-width=200 samples/ src/ tests/ --ignore=samples/Header.php --standard=PHPCompatibility --runtime-set testVersion 7.1- -n"
         ]
     },
     "require": {
-        "php": "^5.6|^7.0",
+        "php": "^7.1",
         "ext-ctype": "*",
         "ext-dom": "*",
         "ext-gd": "*",
@@ -84,4 +84,4 @@
             "PhpOffice\\PhpSpreadsheetTests\\": "tests/PhpSpreadsheetTests"
         }
     }
-}
+}

docs/index.md

@@ -25,12 +25,9 @@ spreadsheet file formats, like Excel and LibreOffice Calc.
 
 ## Software requirements
 
-The following software is required to develop using PhpSpreadsheet:
-
--   PHP version 5.6 or newer
--   PHP extension php\_zip enabled
--   PHP extension php\_xml enabled
--   PHP extension php\_gd2 enabled (if not compiled in)
+PHP version 7.1 or newer to develop using PhpSpreadsheet. Other requirements, such as PHP extensions, are enforced by
+composer. See the `require` section of [the composer.json file](https://github.com/PHPOffice/PhpSpreadsheet/blob/master/composer.json)
+for details.
 
 ### PHP version support
 

samples/index.php

@@ -3,7 +3,7 @@
 require_once 'Header.php';
 
 $requirements = [
-    'PHP 5.6.0' => version_compare(PHP_VERSION, '5.6.0', '>='),
+    'PHP 7.1.0' => version_compare(PHP_VERSION, '7.1.0', '>='),
     'PHP extension XML' => extension_loaded('xml'),
     'PHP extension xmlwriter' => extension_loaded('xmlwriter'),
     'PHP extension mbstring' => extension_loaded('mbstring'),

src/PhpSpreadsheet/Settings.php

@@ -30,7 +30,6 @@ class Settings
      *      7.2 < 7.2.1
      *      7.1 < 7.1.13
      *      7.0 < 7.0.27
-     *      5.6 ANY
      * then you may need to disable this check to prevent unwanted behaviour in other threads
      * SECURITY WARNING: Changing this flag is not recommended.
      *
@@ -122,7 +121,6 @@ public static function getLibXmlLoaderOptions()
      *      7.2 < 7.2.1
      *      7.1 < 7.1.13
      *      7.0 < 7.0.27
-     *      5.6 ANY
      * then you may need to disable this check to prevent unwanted behaviour in other threads
      * SECURITY WARNING: Changing this flag to false is not recommended.
      *

tests/PhpSpreadsheetTests/Cell/CoordinateTest.php

@@ -243,10 +243,6 @@ public function testBuildRangeInvalid()
     {
         $this->expectException(\TypeError::class);
 
-        if (PHP_MAJOR_VERSION < 7) {
-            $this->markTestSkipped('Cannot catch type hinting error with PHP 5.6');
-        }
-
         $cellRange = '';
         Coordinate::buildRange($cellRange);
     }