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Add fromPhp tip

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`@@ -90,6 +90,17 @@ register.`
`90`	`90`	`}`
`91`	`91`	`}`
`92`	`92`
	`93`	`+..tip::`
	`94`	`+`
	`95`	`+ You can create an expression expression from a PHP function with the`
	`96`	+:method:`Symfony\\Component\\ExpressionLanguage\\ExpressionFunction::fromPhp` static method::
	`97`	`+`
	`98`	`+ ExpressionFunction::fromPhp('strtoupper');`
	`99`	`+`
	`100`	`+ It allows namespaced PHP function where second parameter must be set to name expression::`
	`101`	`+`
	`102`	`+ ExpressionFunction::fromPhp('My\strtoupper', 'my_strtoupper');`
	`103`	`+`
`93`	`104`	`You can register providers using`
`94`	`105`	:method:`Symfony\\Component\\ExpressionLanguage\\ExpressionLanguage::registerProvider`
`95`	`106`	`or by using the second argument of the constructor::`

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