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fix(antd-php): use cost-estimate fields in example 02 to avoid stringification fatal#74

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fix/php-example-cost-stringification
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fix(antd-php): use cost-estimate fields in example 02 to avoid stringification fatal#74
Nic-dorman wants to merge 1 commit into
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fix/php-example-cost-stringification

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Fixes #66.

The example interpolated the whole UploadCostEstimate object into a string, which lacks __toString() and so fatals on PHP 8.3:

PHP Fatal error: Uncaught Error: Object of class Autonomi\Antd\Models\UploadCostEstimate could not be converted to string in 02-data.php:17

Print individual cost-estimate fields instead, matching what the Python / Rust / Kotlin examples already do. Also adds a round-trip assertion and an OK marker so the example self-verifies (useful for any cross-language e2e harness).

Test plan

  • php examples/02-data.php against a local devnet — exits 0, prints estimate fields, stored address, and "Public data round-trip OK!"
  • Verified via the cross-SDK e2e harness used to find this bug

Sample output

Estimate: 16 bytes in 3 chunks, storage 43945312500000000 atto, gas 150000000000000 wei, mode single
Stored at address: 01b06330e4f4a8c565087e4087caabf860bdadbe96b7b8f0447493b0081c2335
Actual cost:  atto tokens
Retrieved: Hello, Autonomi!
Public data round-trip OK!

(The Actual cost: line being blank is unrelated — PutResult.cost arrives as an empty string from the daemon; not addressed in this PR.)

…ification fatal

The example interpolated the whole UploadCostEstimate object into a
string, which lacks __toString() and so fatals on PHP 8.3:

  PHP Fatal error: Object of class Autonomi\Antd\Models\UploadCostEstimate
  could not be converted to string in 02-data.php:17

Print individual fields instead, matching the Python/Rust/Kotlin examples.
Also adds a round-trip assertion and an OK marker so the example self-verifies.

Closes #66
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antd-php example 02-data.php fatals: UploadCostEstimate not stringable

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