Merge branch 'PHP-7.4'

diff --cc ext/standard/string.c
Simple merge

diff --cc ext/standard/tests/strings/substr_compare.phpt
index 2e3256631c33f7bb7dc516abe146c056402dde9a,f1edf0afdf108e22cf564395d03a073187b1d2fd..9d4bac4ba9938dff209609e7fb739c7bda3b9ae8
--- 1/ext/standard/tests/strings/substr_compare.phpt
--- 2/ext/standard/tests/strings/substr_compare.phpt
+++ b/ext/standard/tests/strings/substr_compare.phpt
@@@ -25,11 -27,12 +25,9 @@@ int(0
  int(0)
  bool(true)
  bool(true)
- 
- Warning: substr_compare(): The start position cannot exceed initial string length in %s on line %d
- bool(false)
+ int(-1)
  bool(true)
  int(0)
 -
 -Warning: substr_compare() expects parameter 5 to be bool, object given in %s on line %d
 -bool(false)
  Test
  
  Warning: substr_compare(): The length must be greater than or equal to zero in %s on line %d