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json: Improve performance of php_json_encode_array() #20092

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Merged
merged 3 commits into from
Oct 8, 2025
+22 −26
Merged

json: Improve performance of php_json_encode_array() #20092

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json: Improve performance of `php_json_encode_array()`
TimWolla Oct 7, 2025
5606d31
Merge branch 'master' into json-encode-optimize
TimWolla Oct 8, 2025
77ec141
UPGRADING
TimWolla Oct 8, 2025
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3 changes: 3 additions & 0 deletions UPGRADING
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Original file line number Diff line number Diff line change
Expand Up @@ -84,3 +84,6 @@ PHP 8.6 UPGRADE NOTES
========================================
14. Performance Improvements
========================================

- JSON:
. Improve performance of encoding arrays and objects.
45 changes: 19 additions & 26 deletions ext/json/json_encoder.c
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Original file line number Diff line number Diff line change
Expand Up @@ -109,7 +109,6 @@ static inline void php_json_encode_double(smart_str *buf, double d, int options)
static zend_result php_json_encode_array(smart_str *buf, zval *val, int options, php_json_encoder *encoder) /* {{{ */
{
bool encode_as_object = options & PHP_JSON_FORCE_OBJECT;
bool need_comma = false;
HashTable *myht, *prop_ht;
zend_refcounted *recursion_rc;

Expand Down Expand Up @@ -161,12 +160,6 @@ static zend_result php_json_encode_array(smart_str *buf, zval *val, int options,
continue;
}

if (need_comma) {
smart_str_appendc(buf, ',');
} else {
need_comma = true;
}

php_json_pretty_print_char(buf, options, '\n');
php_json_pretty_print_indent(buf, options, encoder);

Expand All @@ -186,6 +179,14 @@ static zend_result php_json_encode_array(smart_str *buf, zval *val, int options,
PHP_JSON_HASH_UNPROTECT_RECURSION(obj);
return FAILURE;
}

smart_str_appendc(buf, ',');
}

bool empty = ZSTR_VAL(buf->s)[ZSTR_LEN(buf->s) - 1] != ',';
if (!empty) {
/* Drop the trailing comma. */
ZSTR_LEN(buf->s)--;
}

PHP_JSON_HASH_UNPROTECT_RECURSION(obj);
Expand All @@ -197,7 +198,7 @@ static zend_result php_json_encode_array(smart_str *buf, zval *val, int options,
}
--encoder->depth;

if (need_comma) {
if (!empty) {
php_json_pretty_print_char(buf, options, '\n');
php_json_pretty_print_indent(buf, options, encoder);
}
Expand Down Expand Up @@ -235,6 +236,7 @@ static zend_result php_json_encode_array(smart_str *buf, zval *val, int options,

uint32_t i = myht ? zend_hash_num_elements(myht) : 0;

bool empty = true;
if (i > 0) {
zend_string *key;
zval *data;
Expand All @@ -247,12 +249,6 @@ static zend_result php_json_encode_array(smart_str *buf, zval *val, int options,
if (!encode_as_object) {
ZEND_ASSERT(Z_TYPE_P(data) != IS_PTR);

if (need_comma) {
smart_str_appendc(buf, ',');
} else {
need_comma = true;
}

php_json_pretty_print_char(buf, options, '\n');
php_json_pretty_print_indent(buf, options, encoder);
} else {
Expand All @@ -276,11 +272,6 @@ static zend_result php_json_encode_array(smart_str *buf, zval *val, int options,
}
}

if (need_comma) {
smart_str_appendc(buf, ',');
} else {
need_comma = true;
}

php_json_pretty_print_char(buf, options, '\n');
php_json_pretty_print_indent(buf, options, encoder);
Expand All @@ -293,12 +284,6 @@ static zend_result php_json_encode_array(smart_str *buf, zval *val, int options,
smart_str_appendl(buf, "\"\"", 2);
}
} else {
if (need_comma) {
smart_str_appendc(buf, ',');
} else {
need_comma = true;
}

php_json_pretty_print_char(buf, options, '\n');
php_json_pretty_print_indent(buf, options, encoder);

Expand All @@ -319,7 +304,15 @@ static zend_result php_json_encode_array(smart_str *buf, zval *val, int options,
return FAILURE;
}
zval_ptr_dtor(&tmp);

smart_str_appendc(buf, ',');
} ZEND_HASH_FOREACH_END();

empty = ZSTR_VAL(buf->s)[ZSTR_LEN(buf->s) - 1] != ',';
if (!empty) {
/* Drop the trailing comma. */
ZSTR_LEN(buf->s)--;
}
}

PHP_JSON_HASH_UNPROTECT_RECURSION(recursion_rc);
Expand All @@ -334,7 +327,7 @@ static zend_result php_json_encode_array(smart_str *buf, zval *val, int options,
--encoder->depth;

/* Only keep closing bracket on same line for empty arrays/objects */
if (need_comma) {
if (!empty) {
php_json_pretty_print_char(buf, options, '\n');
php_json_pretty_print_indent(buf, options, encoder);
}
Expand Down