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Fixed bug #79849 #5853

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Fixed bug #79849 #5853

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5 changes: 3 additions & 2 deletions ext/standard/string.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2823,8 +2823,9 @@ PHP_FUNCTION(chr)
Uppercase the first character of the word in a native string */
static zend_string* php_ucfirst(zend_string *str)
{
unsigned char r = toupper(ZSTR_VAL(str)[0]);
if (r == ZSTR_VAL(str)[0]) {
const unsigned char ch = ZSTR_VAL(str)[0];
unsigned char r = toupper(ch);
if (r == ch) {
return zend_string_copy(str);
} else {
zend_string *s = zend_string_init(ZSTR_VAL(str), ZSTR_LEN(str), 0);
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