doc/php: Fix headline conflicts
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# PHP
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# PHP {#sec-php}
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## User Guide
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## User Guide {#ssec-php-user-guide}
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### Using PHP
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#### Overview
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### Overview {#ssec-php-user-guide-overview}
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Several versions of PHP are available on Nix, each of which having a
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wide variety of extensions and libraries available.
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@ -36,7 +34,7 @@ opcache extension shipped with PHP is available at
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`php.extensions.opcache` and the third-party ImageMagick extension at
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`php.extensions.imagick`.
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#### Installing PHP with extensions
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### Installing PHP with extensions {#ssec-php-user-guide-installing-with-extensions}
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A PHP package with specific extensions enabled can be built using
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`php.withExtensions`. This is a function which accepts an anonymous
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@ -89,7 +87,7 @@ php.buildEnv {
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}
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```
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##### Example setup for `phpfpm`
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#### Example setup for `phpfpm` {#ssec-php-user-guide-installing-with-extensions-phpfpm}
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You can use the previous examples in a `phpfpm` pool called `foo` as
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follows:
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@ -113,7 +111,7 @@ in {
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};
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```
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##### Example usage with `nix-shell`
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#### Example usage with `nix-shell` {#ssec-php-user-guide-installing-with-extensions-nix-shell}
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This brings up a temporary environment that contains a PHP interpreter
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with the extensions `imagick` and `opcache` enabled:
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