Belt 介绍
Belt 是 PHP 便捷开发工具。
Belt 主要特性：
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60+ 的有用函数
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经过完整的测试
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代码清晰明了，文档齐全
Belt 包括：
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boolean isDate(mixed $value)
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boolean isNumber(mixed $value)
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boolean isString(mixed $value)
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boolean isFunction(mixed $value)
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boolean isEmpty(mixed $value)
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boolean isEqual(mixed $left, mixed $right)
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boolean isBoolean(mixed $value)
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boolean isObject(mixed $value)
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boolean isArray(mixed $value)
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boolean isTraversable(mixed $value)
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boolean isNull(mixed $value)
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boolean has(mixed $object, string $key)
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array keys(mixed $object)
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array values(mixed $object)
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array methods(mixed $object)
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mixed copy(mixed $value)
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mixed extend(mixed $source, mixed $destination)
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mixed apply(mixed $object, Closure $closure)
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mixed defaults(mixed $object, array|mixed $defaults)
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string escape(string $string)
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string id(string $prefix = '')
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mixed with(mixed $value)
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void times(integer $number, Closure $closure)
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mixed cache(Closure $closure)
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mixed wrap(Closure $closure, Closure $wrapper)
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mixed compose(array $closures, array $arguments = array())
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void once(Closure $closure)
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mixed after(integer $number, Closure $closure)
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mixed|array first(array $elements, integer $amount = 1)
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array initial(array $elements, integer $amount = 1)
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array rest(array $elements, integer $index = 1)
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mixed|array last(array $elements, integer $amount = 1)
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array pack(array $elements)
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array flatten(array $elements)
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array range(integer $to, integer $from = 0, integer $step = 1)
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array difference(array $one, array $another)
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array unique(array $elements, Closure $iterator = null)
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array without(array $elements, array $ignore)
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array zip(array $one, array $another)
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integer indexOf(array $elements, mixed $element)
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array intersection(array $one, array $another)
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array union(array $one, array $another)
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void each(array $collection, Closure $iterator)
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array map(array $collection, Closure $iterator)
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array toArray(mixed $value)
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integer|null size(array|Countable $value)
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array shuffle(array $collection)
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boolean any(array $collection, Closure $iterator)
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boolean all(array $collection, Closure $iterator)
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array reject(array $collection, Closure $iterator)
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array pluck(array $collection, string $key)
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boolean contains(array $collection, mixed $value)
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array invoke(array $collection, string $function)
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mixed reduce(array $collection, Closure $iterator, mixed $initial = 0)
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array sortBy(array $collection, Closure $iterator)
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array groupBy(array $collection, Closure $iterator)
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mixed max(array $collection)
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mixed min(array $collection)
简单示例：
use Belt\Belt; Belt::max([1, 2, 3]) // => 3 Belt::flatten([1, [2, [3]]]) // => [1, 2, 3] Belt::last([1, 2, 3], 2) // => [2, 3]
Belt 官网
https://github.com/ilya-dev/belt
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