is_serialized_string( string $data ): bool
- Since
- 2.0.5
- Source
wp-includes/functions.php:741
Compatibility
- WordPress
- since 2.0.5
- PHP
- 7.4–8.6-dev
- 6.7.7
- 6.8.8
- 6.9.7
- 7.0.4
- 7.1.0
Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.
Parameters
$datastring- Serialized data.
Return value
bool- False if not a serialized string, true if it is.
Performance profile
How much work a call to is_serialized_string() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.
- Cost class
- Trivial
- Scaling
- Constant
- Instructions
- 4–24
- Plugin surface
- None
- Called by
- 1
Touches nothing outside its own arguments.
No loop in the body: the same number of instructions runs whatever you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 30.
Nothing here hands control to plugin code.
1 place in core call this, so the cost is paid more often than your own code shows.
What one call costs · 2 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost is_serialized_string() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 4–12 | none |
is_string($data) | 17–24 | str_ends_with() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 30 | 4–24 | 6 | |
| 8.5 | 30 | 4–24 | 6 | |
| 8.4 | 30 | 4–24 | 6 | 5 fewer instructions than PHP 8.3 |
| 8.3 | 35 | 4–29 | 6 | |
| 8.2 | 35 | 4–29 | 6 | |
| 8.1 | 35 | 4–29 | 6 | |
| 7.4 | 35 | 4–29 | 6 |
An instruction is not a fixed amount of time, so a matching count is not necessarily the same speed; what it rules out is a difference in the work itself.
Uses · 1
- str_ends_with()Polyfill for `str_ends_with()` function added in PHP 8.0.
Used by · 1
- _list_meta_row()Outputs a single row of public meta data in the Custom Fields meta box.
Source code
function is_serialized_string( $data ) { // if it isn't a string, it isn't a serialized string. if ( ! is_string( $data ) ) { return false; } $data = trim( $data ); if ( strlen( $data ) < 4 ) { return false; } elseif ( ':' !== $data[1] ) { return false; } elseif ( ! str_ends_with( $data, ';' ) ) { return false; } elseif ( 's' !== $data[0] ) { return false; } elseif ( '"' !== substr( $data, -2, 1 ) ) { return false; } else { return true; }}Changelog
Introduced in 2.0.5. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
About this page
- Parsed data
- Generated from the wordpress-develop 7.0.4 tag, from
src/wp-includes/functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it. - Corrections
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