diff --git a/core/includes/bootstrap.inc b/core/includes/bootstrap.inc
index e18bfa2..68d8cb8 100644
--- a/core/includes/bootstrap.inc
+++ b/core/includes/bootstrap.inc
@@ -22,6 +22,10 @@
  *
  * Updates cannot be run on versions of PHP older than this version.
  *
+ * The installer exits early on versions of PHP older than this version.
+ *
+ * @see install.php
+ *
  * @todo Move this to an appropriate autoloadable class. See
  *   https://www.drupal.org/project/drupal/issues/2908079
  */
@@ -33,7 +37,7 @@
  * @todo Move this to an appropriate autoloadable class. See
  *   https://www.drupal.org/project/drupal/issues/2908079
  */
-const DRUPAL_MINIMUM_INSTALL_PHP = '7.0.0';
+const DRUPAL_MINIMUM_INSTALL_PHP = '7.0.8';
 
 /**
  * Minimum recommended version of PHP.
diff --git a/core/modules/simpletest/src/InstallerTestBase.php b/core/modules/simpletest/src/InstallerTestBase.php
index d51b2e9..072bb58 100644
--- a/core/modules/simpletest/src/InstallerTestBase.php
+++ b/core/modules/simpletest/src/InstallerTestBase.php
@@ -253,7 +253,7 @@ protected function refreshVariables() {
    *   a warning not in the list is present, a fail is raised.
    */
   protected function continueOnExpectedWarnings($expected_warnings = []) {
-    $this->assertFalse(strpos($this->getTextContent(), 'Errors found'));
+    $this->assertNoText('Errors found');
     $this->assertWarningSummaries($expected_warnings);
     $this->clickLink('continue anyway');
   }
diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index 6131f72..37d1e77 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -187,7 +187,7 @@ function system_requirements($phase) {
   }
 
   if (version_compare($phpversion, DRUPAL_MINIMUM_PHP) < 0) {
-    $requirements['php']['description'] = t('Your PHP installation is too old. Drupal requires at least PHP %version.', ['%version' => DRUPAL_MINIMUM_PHP]);
+    $requirements['php']['description'] = t('Your PHP installation is too old. Drupal requires at least PHP %version.', ['%version' => DRUPAL_MINIMUM_INSTALL_PHP]);
     $requirements['php']['severity'] = REQUIREMENT_ERROR;
     // If PHP is old, it's not safe to continue with the requirements check.
     return $requirements;
@@ -203,8 +203,6 @@ function system_requirements($phase) {
     elseif (!drupal_valid_test_ua()) {
       $requirements['php']['description'] = t('Your PHP installation is too old. Drupal requires at least PHP %version.', ['%version' => DRUPAL_MINIMUM_INSTALL_PHP]);
       $requirements['php']['severity'] = REQUIREMENT_ERROR;
-      // If PHP is old, it's not safe to continue with the requirements check.
-      return $requirements;
     }
   }
   if (version_compare($phpversion, DRUPAL_RECOMMENDED_PHP) < 0) {
diff --git a/core/tests/Drupal/FunctionalTests/Installer/InstallerTestBase.php b/core/tests/Drupal/FunctionalTests/Installer/InstallerTestBase.php
index 6e48b4c..6a0a3b9 100644
--- a/core/tests/Drupal/FunctionalTests/Installer/InstallerTestBase.php
+++ b/core/tests/Drupal/FunctionalTests/Installer/InstallerTestBase.php
@@ -284,7 +284,7 @@ protected function refreshVariables() {
    *   a warning not in the list is present, a fail is raised.
    */
   protected function continueOnExpectedWarnings($expected_warnings = []) {
-    $this->assertFalse(strpos($this->getTextContent(), 'Errors found'));
+    $this->assertNoText('Errors found');
     $this->assertWarningSummaries($expected_warnings);
     $this->clickLink('continue anyway');
     $this->checkForMetaRefresh();
diff --git a/core/tests/Drupal/Tests/RequirementsPageTrait.php b/core/tests/Drupal/Tests/RequirementsPageTrait.php
index 6687cdf..fc30c8c 100644
--- a/core/tests/Drupal/Tests/RequirementsPageTrait.php
+++ b/core/tests/Drupal/Tests/RequirementsPageTrait.php
@@ -15,23 +15,12 @@
    *   link to go to the next screen.
    */
   protected function continueOnExpectedWarnings($link_label) {
-    if (strpos($this->getTextContent(), 'Requirements problem') === FALSE) {
-      return;
-    }
-
-    $this->assertNoText('Errors found');
-    $this->assertRequirementWarnings();
-    $this->clickLink($link_label);
-    $this->checkForMetaRefresh();
-  }
-
-  /**
-   * Assert the expected requirement warnings are present on the page.
-   */
-  protected function assertRequirementWarnings() {
     // Assert a warning is shown on older test environments.
     if (version_compare(phpversion(), DRUPAL_MINIMUM_INSTALL_PHP) < 0) {
+      $this->assertNoText('Errors found');
       $this->assertWarningSummaries(['PHP']);
+      $this->clickLink($link_label);
+      $this->checkForMetaRefresh();
     }
   }