there is such code in the php_implode() function:
[snip]
while (zend_hash_get_current_data_ex(Z_ARRVAL_P(arr),
(void **) &tmp,
&pos) == SUCCESS) {
SEPARATE_ZVAL(tmp);
convert_to_string(*tmp);
[snip]
SEPARATE_ZVAL() always duplicates data of the tmp, even
Z_TYPE_PP(tmp) == IS_STRING.
It is terrible slowdowns the implode() function.
So, changing the strings
SEPARATE_ZVAL(tmp);
convert_to_string(*tmp);
to
convert_to_string_ex(tmp);
will increase speed twice, because most of elements in the imploding
array has IS_STRING type.
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