Leverage PHP 8.0 string functions

src/functions.php

@@ -45,6 +45,7 @@
 use function is_string;
 use function MongoDB\BSON\fromPHP;
 use function MongoDB\BSON\toPHP;
+use function str_ends_with;
 use function substr;
 
 /**
@@ -497,7 +498,7 @@ function create_field_path_type_map(array $typeMap, string $fieldPath): array
     /* Special case if we want to convert an array, in which case we need to
      * ensure that the field containing the array is exposed as an array,
      * instead of the type given in the type map's array key. */
-    if (substr($fieldPath, -2, 2) === '.$') {
+    if (str_ends_with($fieldPath, '.$')) {
         $typeMap['fieldPaths'][substr($fieldPath, 0, -2)] = 'array';
     }
 

tests/UnifiedSpecTests/Constraint/Matches.php

@@ -37,7 +37,7 @@
 use function PHPUnit\Framework\logicalOr;
 use function range;
 use function sprintf;
-use function strpos;
+use function str_starts_with;
 use function strrchr;
 
 /**
@@ -373,7 +373,7 @@ private static function getOperatorName(BSONDocument $document): string
     {
         // phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
         foreach ($document as $key => $_) {
-            if (strpos((string) $key, '$$') === 0) {
+            if (str_starts_with((string) $key, '$$')) {
                 return $key;
             }
         }
@@ -394,7 +394,7 @@ private static function isOperator(BSONDocument $document): bool
 
         // phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
         foreach ($document as $key => $_) {
-            return strpos((string) $key, '$$') === 0;
+            return str_starts_with((string) $key, '$$');
         }
 
         throw new LogicException('should not reach this point');

tests/UnifiedSpecTests/UnifiedTestRunner.php

@@ -35,6 +35,7 @@
 use function PHPUnit\Framework\assertNotFalse;
 use function preg_replace;
 use function sprintf;
+use function str_starts_with;
 use function strlen;
 use function strpos;
 use function substr_replace;
@@ -528,7 +529,7 @@ private function createContext(): Context
             // We assume the internal client URI has multiple mongos hosts
             $multiMongosUri = $this->internalClientUri;
 
-            if (strpos($multiMongosUri, 'mongodb+srv://') === 0) {
+            if (str_starts_with($multiMongosUri, 'mongodb+srv://')) {
                 /* TODO: If an SRV URI is provided, we can consider connecting and
                  * checking the topology for multiple mongoses and then selecting a
                  * single mongos to reconstruct a single mongos URI; however, that