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@ 2016-01-09T15:13:22Z

<?php

$str = <<<END
{
  "Pet": {
    "type": "object",
    "required": [
      "id"
    ],
    "properties": {
      "id": {
        "type": "integer",
        "format": "int64"
      }
    }
  },
  "Dog": {
    "type": "object",
      "allOf": [
        {
          "$ref": "#/definitions/Pet"
        },
        {
          "required": [
            "name"
          ],
          "properties": {
            "name": {
              "type": "string"
            }
          }
        }
      ],
    "x-vendor-ext": "some data"
  }
}
END;

echo str_replace("\t", "  ", $str);

Output
Performance
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References
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str_replace: documentation ( source)

preferences:dark modelive preview

53.04 ms | 402 KiB | 5 Q