Minor fixes:

* Ensure that php linter pattern does not include spaces:
    PHP can return errors with extra spaces like the following:
    `PHP Parse error:  syntax error, unexpected end of file in t.php on line 4`

* Set option locally to buffer

* Rename noErrors variable according to the project's naming convention

* Make the jsonlint pattern a little better

ale_linters/json/jsonlint.vim

@@ -10,7 +10,7 @@ function! ale_linters#json#jsonlint#Handle(buffer, lines)
     " Matches patterns like the following:
     " line 2, col 15, found: 'STRING' - expected: 'EOF', '}', ',', ']'.
 
-    let pattern = 'line \(\d\+\), col \(\d*\), \(.\+\)'
+    let pattern = '^line \(\d\+\), col \(\d*\), \(.\+\)$'
     let output = []
 
     for line in a:lines

ale_linters/php/php.vim

@@ -11,7 +11,7 @@ function! ale_linters#php#php#Handle(buffer, lines)
     " Matches patterns like the following:
     "
     " Parse error: parse error in - on line 7
-    let pattern = 'Parse error: \(.\+\) on line \(\d\+\)'
+    let pattern = 'Parse error:\s\+\(.\+\) on line \(\d\+\)'
     let output = []
 
     for line in a:lines