# Elasticsearch painless script php

**URL:** <https://discuss.elastic.co/t/elasticsearch-painless-script-php/95977>\
**Category:** Elasticsearch\
**Created:** [August 5, 2017, 1:01pm UTC](https://discuss.elastic.co/t/elasticsearch-painless-script-php/95977 "2017-08-05T13:01:54Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![svarup](https://avatars.discourse-cdn.com/v4/letter/s/ee59a6/32.png) [@svarup](https://discuss.elastic.co/u/svarup)\
**Post date:** [August 5, 2017, 1:01pm UTC](https://discuss.elastic.co/t/elasticsearch-painless-script-php/95977/1 "2017-08-05T13:01:54Z")

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Elasticsearch update by query can't update field with null value

$a = NULL;  
$b = NULL;

'script' =\> [  
'inline' =\> "ctx.\_source.a = $a; ctx.\_source.b = $b;",  
'lang' =\> 'painless',  
],

give me compile error "script\_stack":["... x.\_source.a = ; ctx.\_source.b ..." invalid sequence of tokens near [';']

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<div class="post-metadata">

**Author:** ![svarup](https://avatars.discourse-cdn.com/v4/letter/s/ee59a6/32.png) [@svarup](https://discuss.elastic.co/u/svarup)\
**Post date:** [August 5, 2017, 1:14pm UTC](https://discuss.elastic.co/t/elasticsearch-painless-script-php/95977/2 "2017-08-05T13:14:49Z")

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it's work if we change $a and $b variable as below

$a = 'null';  
$b = 'null';

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [September 2, 2017, 1:14pm UTC](https://discuss.elastic.co/t/elasticsearch-painless-script-php/95977/3 "2017-09-02T13:14:51Z")

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